161507517055 has 8 divisors (see below), whose sum is σ = 200060924544. Its totient is φ = 125038077600.

The previous prime is 161507517047. The next prime is 161507517071. The reversal of 161507517055 is 550715705161.

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

It is not a de Polignac number, because 161507517055 - 2³ = 161507517047 is a prime.

It is a super-2 number, since 2×161507517055² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 520991836 + ... + 520992145.

It is an arithmetic number, because the mean of its divisors is an integer number (25007615568).

Almost surely, 2^161507517055 is an apocalyptic number.

161507517055 is a deficient number, since it is larger than the sum of its proper divisors (38553407489).

161507517055 is a wasteful number, since it uses less digits than its factorization.

161507517055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041984017.

The product of its (nonzero) digits is 183750, while the sum is 43.

The spelling of 161507517055 in words is "one hundred sixty-one billion, five hundred seven million, five hundred seventeen thousand, fifty-five".