1660225706172 has 144 divisors (see below), whose sum is σ = 4723629281280. Its totient is φ = 487357603200.

The previous prime is 1660225706141. The next prime is 1660225706263. The reversal of 1660225706172 is 2716075220661.

1660225706172 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 2 + 2 + 570 + 6 + 1 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1157397 + ... + 2158707.

It is an arithmetic number, because the mean of its divisors is an integer number (32802981120).

Almost surely, 2^{1660225706172} is an apocalyptic number.

1660225706172 is a gapful number since it is divisible by the number (12) 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 1660225706172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2361814640640).

1660225706172 is an abundant number, since it is smaller than the sum of its proper divisors (3063403575108).

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

1660225706172 is a wasteful number, since it uses less digits than its factorization.

1660225706172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001464 (or 1001459 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 1660225706172 in words is "one trillion, six hundred sixty billion, two hundred twenty-five million, seven hundred six thousand, one hundred seventy-two".