161505113915 has 8 divisors (see below), whose sum is σ = 195285573648. Its totient is φ = 128217799840.

The previous prime is 161505113909. The next prime is 161505113993. The reversal of 161505113915 is 519311505161.

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

It is not a de Polignac number, because 161505113915 - 2⁴ = 161505113899 is a prime.

It is a Duffinian number.

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, 123285692 + ... + 123287001.

It is an arithmetic number, because the mean of its divisors is an integer number (24410696706).

Almost surely, 2^161505113915 is an apocalyptic number.

161505113915 is a deficient number, since it is larger than the sum of its proper divisors (33780459733).

161505113915 is a wasteful number, since it uses less digits than its factorization.

161505113915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246572829.

The product of its (nonzero) digits is 20250, while the sum is 38.

The spelling of 161505113915 in words is "one hundred sixty-one billion, five hundred five million, one hundred thirteen thousand, nine hundred fifteen".