156165640 has 16 divisors (see below), whose sum is σ = 351372780. Its totient is φ = 62466240.

The previous prime is 156165623. The next prime is 156165649. The reversal of 156165640 is 46561651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 151930276 + 4235364 = 12326^2 + 2058^2 .

It is a junction number, because it is equal to n+sod(n) for n = 156165596 and 156165605.

It is not an unprimeable number, because it can be changed into a prime (156165649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1952031 + ... + 1952110.

Almost surely, 2^156165640 is an apocalyptic number.

156165640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156165640 is an abundant number, since it is smaller than the sum of its proper divisors (195207140).

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

156165640 is a wasteful number, since it uses less digits than its factorization.

156165640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904152 (or 3904148 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 156165640 is about 12496.6251444140. The cubic root of 156165640 is about 538.5117227324.

The spelling of 156165640 in words is "one hundred fifty-six million, one hundred sixty-five thousand, six hundred forty".