161456020565 has 16 divisors (see below), whose sum is σ = 229060759680. Its totient is φ = 106895019840.

The previous prime is 161456020511. The next prime is 161456020571. The reversal of 161456020565 is 565020654161.

It is not a de Polignac number, because 161456020565 - 2⁸ = 161456020309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79533971 + ... + 79536000.

It is an arithmetic number, because the mean of its divisors is an integer number (14316297480).

Almost surely, 2^161456020565 is an apocalyptic number.

It is an amenable number.

161456020565 is a deficient number, since it is larger than the sum of its proper divisors (67604739115).

161456020565 is a wasteful number, since it uses less digits than its factorization.

161456020565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159070012.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 161456020565 in words is "one hundred sixty-one billion, four hundred fifty-six million, twenty thousand, five hundred sixty-five".