161565115016 has 8 divisors (see below), whose sum is σ = 302934590670. Its totient is φ = 80782557504.

The previous prime is 161565115003. The next prime is 161565115087. The reversal of 161565115016 is 610511565161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 127541836900 + 34023278116 = 357130^2 + 184454^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×161565115016² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10097819681 + ... + 10097819696.

Almost surely, 2^161565115016 is an apocalyptic number.

It is an amenable number.

161565115016 is a deficient number, since it is larger than the sum of its proper divisors (141369475654).

161565115016 is a wasteful number, since it uses less digits than its factorization.

161565115016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20195639383 (or 20195639379 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 161565115016 in words is "one hundred sixty-one billion, five hundred sixty-five million, one hundred fifteen thousand, sixteen".