161201639996 has 12 divisors (see below), whose sum is σ = 286727507640. Its totient is φ = 79279494960.

The previous prime is 161201639971. The next prime is 161201640037. The reversal of 161201639996 is 699936102161.

It is a happy number.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330330986 + ... + 330331473.

It is an arithmetic number, because the mean of its divisors is an integer number (23893958970).

Almost surely, 2^161201639996 is an apocalyptic number.

It is an amenable number.

161201639996 is a deficient number, since it is larger than the sum of its proper divisors (125525867644).

161201639996 is a wasteful number, since it uses less digits than its factorization.

161201639996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660662524 (or 660662522 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 53.

The spelling of 161201639996 in words is "one hundred sixty-one billion, two hundred one million, six hundred thirty-nine thousand, nine hundred ninety-six".