161813583544 has 32 divisors (see below), whose sum is σ = 304450380000. Its totient is φ = 80627121792.

The previous prime is 161813583539. The next prime is 161813583551. The reversal of 161813583544 is 445385318161.

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, 4430542 + ... + 4466914.

It is an arithmetic number, because the mean of its divisors is an integer number (9514074375).

Almost surely, 2^161813583544 is an apocalyptic number.

It is an amenable number.

161813583544 is a deficient number, since it is larger than the sum of its proper divisors (142636796456).

161813583544 is a wasteful number, since it uses less digits than its factorization.

161813583544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38287 (or 38283 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 49.

The spelling of 161813583544 in words is "one hundred sixty-one billion, eight hundred thirteen million, five hundred eighty-three thousand, five hundred forty-four".