161606615515 has 8 divisors (see below), whose sum is σ = 194078394720. Its totient is φ = 129184988352.

The previous prime is 161606615473. The next prime is 161606615539. The reversal of 161606615515 is 515516606161.

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

It is a cyclic number.

It is not a de Polignac number, because 161606615515 - 2²⁷ = 161472397787 is a prime.

It is a super-2 number, since 2×161606615515² (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, 12530919 + ... + 12543808.

It is an arithmetic number, because the mean of its divisors is an integer number (24259799340).

Almost surely, 2^161606615515 is an apocalyptic number.

161606615515 is a deficient number, since it is larger than the sum of its proper divisors (32471779205).

161606615515 is a wasteful number, since it uses less digits than its factorization.

161606615515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25076021.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 161606615515 in words is "one hundred sixty-one billion, six hundred six million, six hundred fifteen thousand, five hundred fifteen".