161564015 has 8 divisors (see below), whose sum is σ = 199116960. Its totient is φ = 125757792.

The previous prime is 161563999. The next prime is 161564021. The reversal of 161564015 is 510465161.

161564015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161564015 - 2⁴ = 161563999 is a prime.

It is a super-2 number, since 2×161564015² = 52205861885840450, 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, 436475 + ... + 436844.

It is an arithmetic number, because the mean of its divisors is an integer number (24889620).

Almost surely, 2^161564015 is an apocalyptic number.

161564015 is a deficient number, since it is larger than the sum of its proper divisors (37552945).

161564015 is an equidigital number, since it uses as much as digits as its factorization.

161564015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873361.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 161564015 is about 12710.7834140937. The cubic root of 161564015 is about 544.6467031008.

The spelling of 161564015 in words is "one hundred sixty-one million, five hundred sixty-four thousand, fifteen".