161664562 has 16 divisors (see below), whose sum is σ = 253471680. Its totient is φ = 77186032.

The previous prime is 161664551. The next prime is 161664571. The reversal of 161664562 is 265466161.

It is a super-2 number, since 2×161664562² = 52270861213303688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27648 + ... + 32980.

It is an arithmetic number, because the mean of its divisors is an integer number (15841980).

Almost surely, 2^161664562 is an apocalyptic number.

161664562 is a deficient number, since it is larger than the sum of its proper divisors (91807118).

161664562 is a wasteful number, since it uses less digits than its factorization.

161664562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6017.

The product of its digits is 51840, while the sum is 37.

The square root of 161664562 is about 12714.7379839303. The cubic root of 161664562 is about 544.7596639721.

The spelling of 161664562 in words is "one hundred sixty-one million, six hundred sixty-four thousand, five hundred sixty-two".