2172394723464 has 480 divisors, whose sum is σ = 7321873901760. Its totient is φ = 589266213120.

The previous prime is 2172394723439. The next prime is 2172394723469. The reversal of 2172394723464 is 4643274932712.

2172394723464 is a `hidden beast` number, since 2 + 1 + 7 + 23 + 94 + 72 + 3 + 464 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 2172394723464.

It is not an unprimeable number, because it can be changed into a prime (2172394723469) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 231027387 + ... + 231036789.

It is an arithmetic number, because the mean of its divisors is an integer number (15253903962).

Almost surely, 2^{2172394723464} is an apocalyptic number.

2172394723464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2172394723464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3660936950880).

2172394723464 is an abundant number, since it is smaller than the sum of its proper divisors (5149479178296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2172394723464 is a wasteful number, since it uses less digits than its factorization.

2172394723464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9543 (or 9499 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 54.

The spelling of 2172394723464 in words is "two trillion, one hundred seventy-two billion, three hundred ninety-four million, seven hundred twenty-three thousand, four hundred sixty-four".