161515015116550 has 24 divisors (see below), whose sum is σ = 318089570948856. Its totient is φ = 60805652749440.

The previous prime is 161515015116479. The next prime is 161515015116629. The reversal of 161515015116550 is 55611510515161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 161515015116497 and 161515015116506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95008831572 + ... + 95008833271.

It is an arithmetic number, because the mean of its divisors is an integer number (13253732122869).

Almost surely, 2^{161515015116550} is an apocalyptic number.

161515015116550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161515015116550 is a deficient number, since it is larger than the sum of its proper divisors (156574555832306).

161515015116550 is a wasteful number, since it uses less digits than its factorization.

161515015116550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190017664872 (or 190017664867 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 43.

The spelling of 161515015116550 in words is "one hundred sixty-one trillion, five hundred fifteen billion, fifteen million, one hundred sixteen thousand, five hundred fifty".