156221645 has 16 divisors (see below), whose sum is σ = 190549632. Its totient is φ = 122938560.

The previous prime is 156221641. The next prime is 156221677. The reversal of 156221645 is 546122651.

156221645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 156221645 - 2² = 156221641 is a prime.

It is a super-3 number, since 3×156221645³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156221641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83015 + ... + 84875.

It is an arithmetic number, because the mean of its divisors is an integer number (11909352).

Almost surely, 2^156221645 is an apocalyptic number.

It is an amenable number.

156221645 is a deficient number, since it is larger than the sum of its proper divisors (34327987).

156221645 is a wasteful number, since it uses less digits than its factorization.

156221645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132.

The product of its digits is 14400, while the sum is 32.

The square root of 156221645 is about 12498.8657485389. The cubic root of 156221645 is about 538.5760897393.

The spelling of 156221645 in words is "one hundred fifty-six million, two hundred twenty-one thousand, six hundred forty-five".