161347560561 has 24 divisors (see below), whose sum is σ = 256865734944. Its totient is φ = 96778287360.

The previous prime is 161347560547. The next prime is 161347560617. The reversal of 161347560561 is 165065743161.

161347560561 is a `hidden beast` number, since 1 + 6 + 1 + 34 + 7 + 5 + 605 + 6 + 1 = 666.

It is not a de Polignac number, because 161347560561 - 2⁵ = 161347560529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161347560461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8391291 + ... + 8410496.

It is an arithmetic number, because the mean of its divisors is an integer number (10702738956).

Almost surely, 2^161347560561 is an apocalyptic number.

161347560561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161347560561 is a deficient number, since it is larger than the sum of its proper divisors (95518174383).

161347560561 is a wasteful number, since it uses less digits than its factorization.

161347560561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16801901 (or 16801898 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 161347560561 in words is "one hundred sixty-one billion, three hundred forty-seven million, five hundred sixty thousand, five hundred sixty-one".