156401664 has 128 divisors (see below), whose sum is σ = 438298080. Its totient is φ = 49545216.

The previous prime is 156401659. The next prime is 156401741. The reversal of 156401664 is 466104651.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×156401664² = 48922961003937792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3637227 + ... + 3637269.

Almost surely, 2^156401664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 156401664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219149040).

156401664 is an abundant number, since it is smaller than the sum of its proper divisors (281896416).

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

156401664 is an frugal number, since it uses more digits than its factorization.

156401664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 156401664 is about 12506.0650885880. The cubic root of 156401664 is about 538.7828829185.

The spelling of 156401664 in words is "one hundred fifty-six million, four hundred one thousand, six hundred sixty-four".