648722173320 has 1280 divisors, whose sum is σ = 2591576064000. Its totient is φ = 144111052800.

The previous prime is 648722173291. The next prime is 648722173321. The reversal of 648722173320 is 23371227846.

648722173320 is a `hidden beast` number, since 6 + 48 + 72 + 217 + 3 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (648722173321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 1959885555 + ... + 1959885885.

It is an arithmetic number, because the mean of its divisors is an integer number (2024668800).

Almost surely, 2^648722173320 is an apocalyptic number.

648722173320 is a gapful number since it is divisible by the number (60) 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 648722173320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295788032000).

648722173320 is an abundant number, since it is smaller than the sum of its proper divisors (1942853890680).

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

648722173320 is a wasteful number, since it uses less digits than its factorization.

648722173320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 648722173320 in words is "six hundred forty-eight billion, seven hundred twenty-two million, one hundred seventy-three thousand, three hundred twenty".