161983602572 has 24 divisors (see below), whose sum is σ = 319904922960. Its totient is φ = 71089981760.

The previous prime is 161983602541. The next prime is 161983602581. The reversal of 161983602572 is 275206389161.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 161983602572.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63471923 + ... + 63474474.

It is an arithmetic number, because the mean of its divisors is an integer number (13329371790).

Almost surely, 2^161983602572 is an apocalyptic number.

It is an amenable number.

161983602572 is a deficient number, since it is larger than the sum of its proper divisors (157921320388).

161983602572 is a wasteful number, since it uses less digits than its factorization.

161983602572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126946441 (or 126946439 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 161983602572 in words is "one hundred sixty-one billion, nine hundred eighty-three million, six hundred two thousand, five hundred seventy-two".