156644716428 has 240 divisors, whose sum is σ = 440193245184. Its totient is φ = 48400934400.

The previous prime is 156644716391. The next prime is 156644716457. The reversal of 156644716428 is 824617446651.

156644716428 is a `hidden beast` number, since 1 + 56 + 64 + 471 + 64 + 2 + 8 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 105626175 + ... + 105627657.

Almost surely, 2^156644716428 is an apocalyptic number.

156644716428 is a gapful number since it is divisible by the number (18) 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 156644716428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220096622592).

156644716428 is an abundant number, since it is smaller than the sum of its proper divisors (283548528756).

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

156644716428 is a wasteful number, since it uses less digits than its factorization.

156644716428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794 (or 1783 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The spelling of 156644716428 in words is "one hundred fifty-six billion, six hundred forty-four million, seven hundred sixteen thousand, four hundred twenty-eight".