156849931784 has 96 divisors (see below), whose sum is σ = 369391518720. Its totient is φ = 61887740544.

The previous prime is 156849931783. The next prime is 156849931793. The reversal of 156849931784 is 487139948651.

It is a super-2 number, since 2×156849931784² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 156849931784.

It is not an unprimeable number, because it can be changed into a prime (156849931783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1911587 + ... + 1991949.

It is an arithmetic number, because the mean of its divisors is an integer number (3847828320).

Almost surely, 2^156849931784 is an apocalyptic number.

156849931784 is a gapful number since it is divisible by the number (14) 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 156849931784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184695759360).

156849931784 is an abundant number, since it is smaller than the sum of its proper divisors (212541586936).

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

156849931784 is a wasteful number, since it uses less digits than its factorization.

156849931784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80779 (or 80768 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 65.

The spelling of 156849931784 in words is "one hundred fifty-six billion, eight hundred forty-nine million, nine hundred thirty-one thousand, seven hundred eighty-four".