161498197556 has 24 divisors (see below), whose sum is σ = 301798640640. Its totient is φ = 75449656800.

The previous prime is 161498197529. The next prime is 161498197573. The reversal of 161498197556 is 655791894161.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22451660 + ... + 22458851.

It is an arithmetic number, because the mean of its divisors is an integer number (12574943360).

Almost surely, 2^161498197556 is an apocalyptic number.

It is an amenable number.

161498197556 is a deficient number, since it is larger than the sum of its proper divisors (140300443084).

161498197556 is a wasteful number, since it uses less digits than its factorization.

161498197556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44910575 (or 44910573 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 62.

The spelling of 161498197556 in words is "one hundred sixty-one billion, four hundred ninety-eight million, one hundred ninety-seven thousand, five hundred fifty-six".