161610515 has 16 divisors (see below), whose sum is σ = 215558496. Its totient is φ = 115315200.

The previous prime is 161610511. The next prime is 161610557. The reversal of 161610515 is 515016161.

It is not a de Polignac number, because 161610515 - 2² = 161610511 is a prime.

It is a super-2 number, since 2×161610515² = 52235917117130450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161610511) 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, 24806 + ... + 30635.

It is an arithmetic number, because the mean of its divisors is an integer number (13472406).

Almost surely, 2^161610515 is an apocalyptic number.

161610515 is a deficient number, since it is larger than the sum of its proper divisors (53947981).

161610515 is a wasteful number, since it uses less digits than its factorization.

161610515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55510.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 161610515 is about 12712.6124380475. The cubic root of 161610515 is about 544.6989499710.

Adding to 161610515 its reverse (515016161), we get a palindrome (676626676).

The spelling of 161610515 in words is "one hundred sixty-one million, six hundred ten thousand, five hundred fifteen".