161520773915 has 8 divisors (see below), whose sum is σ = 205226395200. Its totient is φ = 121615641472.

The previous prime is 161520773891. The next prime is 161520773927. The reversal of 161520773915 is 519377025161.

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 161520773915 - 2¹⁰ = 161520772891 is a prime.

It is a super-2 number, since 2×161520773915² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161520773915.

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, 950122115 + ... + 950122284.

It is an arithmetic number, because the mean of its divisors is an integer number (25653299400).

Almost surely, 2^161520773915 is an apocalyptic number.

161520773915 is a deficient number, since it is larger than the sum of its proper divisors (43705621285).

161520773915 is a wasteful number, since it uses less digits than its factorization.

161520773915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900244421.

The product of its (nonzero) digits is 396900, while the sum is 47.

The spelling of 161520773915 in words is "one hundred sixty-one billion, five hundred twenty million, seven hundred seventy-three thousand, nine hundred fifteen".