161560720402 has 16 divisors (see below), whose sum is σ = 252068154624. Its totient is φ = 77577786000.

The previous prime is 161560720351. The next prime is 161560720471. The reversal of 161560720402 is 204027065161.

It is a super-2 number, since 2×161560720402² (a number of 23 digits) contains 22 as substring.

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, 9937749 + ... + 9953992.

It is an arithmetic number, because the mean of its divisors is an integer number (15754259664).

Almost surely, 2^161560720402 is an apocalyptic number.

161560720402 is a deficient number, since it is larger than the sum of its proper divisors (90507434222).

161560720402 is a wasteful number, since it uses less digits than its factorization.

161560720402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19891905.

The product of its (nonzero) digits is 20160, while the sum is 34.

Adding to 161560720402 its reverse (204027065161), we get a palindrome (365587785563).

The spelling of 161560720402 in words is "one hundred sixty-one billion, five hundred sixty million, seven hundred twenty thousand, four hundred two".