156221664 has 24 divisors (see below), whose sum is σ = 410082120. Its totient is φ = 52073856.

The previous prime is 156221641. The next prime is 156221677. The reversal of 156221664 is 466122651.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813559 + ... + 813750.

It is an arithmetic number, because the mean of its divisors is an integer number (17086755).

Almost surely, 2^156221664 is an apocalyptic number.

It is an amenable number.

156221664 is an abundant number, since it is smaller than the sum of its proper divisors (253860456).

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

156221664 is a wasteful number, since it uses less digits than its factorization.

156221664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627322 (or 1627314 counting only the distinct ones).

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

The square root of 156221664 is about 12498.8665086079. The cubic root of 156221664 is about 538.5761115735.

The spelling of 156221664 in words is "one hundred fifty-six million, two hundred twenty-one thousand, six hundred sixty-four".