161557764307 has 8 divisors (see below), whose sum is σ = 163780989584. Its totient is φ = 159334812288.

The previous prime is 161557764301. The next prime is 161557764323. The reversal of 161557764307 is 703467755161.

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 161557764307 - 2³⁵ = 127198025939 is a prime.

It is a super-2 number, since 2×161557764307² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161557764301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1313008 + ... + 1430770.

It is an arithmetic number, because the mean of its divisors is an integer number (20472623698).

Almost surely, 2^161557764307 is an apocalyptic number.

161557764307 is a deficient number, since it is larger than the sum of its proper divisors (2223225277).

161557764307 is a wasteful number, since it uses less digits than its factorization.

161557764307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136629.

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 161557764307 in words is "one hundred sixty-one billion, five hundred fifty-seven million, seven hundred sixty-four thousand, three hundred seven".