161564738 has 8 divisors (see below), whose sum is σ = 245964432. Its totient is φ = 79576596.

The previous prime is 161564737. The next prime is 161564747. The reversal of 161564738 is 837465161.

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

It is a super-2 number, since 2×161564738² = 52206329130017288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161564695 and 161564704.

It is not an unprimeable number, because it can be changed into a prime (161564737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602720 + ... + 602987.

It is an arithmetic number, because the mean of its divisors is an integer number (30745554).

Almost surely, 2^161564738 is an apocalyptic number.

161564738 is a deficient number, since it is larger than the sum of its proper divisors (84399694).

161564738 is a wasteful number, since it uses less digits than its factorization.

161564738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205776.

The product of its digits is 120960, while the sum is 41.

The square root of 161564738 is about 12710.8118544804. The cubic root of 161564738 is about 544.6475155321.

The spelling of 161564738 in words is "one hundred sixty-one million, five hundred sixty-four thousand, seven hundred thirty-eight".