161718599456 has 24 divisors (see below), whose sum is σ = 318528154224. Its totient is φ = 80822560320.

The previous prime is 161718599443. The next prime is 161718599467. The reversal of 161718599456 is 654995817161.

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, 1076510 + ... + 1217501.

It is an arithmetic number, because the mean of its divisors is an integer number (13272006426).

Almost surely, 2^161718599456 is an apocalyptic number.

161718599456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161718599456 is a deficient number, since it is larger than the sum of its proper divisors (156809554768).

161718599456 is a wasteful number, since it uses less digits than its factorization.

161718599456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296224 (or 2296216 counting only the distinct ones).

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

The spelling of 161718599456 in words is "one hundred sixty-one billion, seven hundred eighteen million, five hundred ninety-nine thousand, four hundred fifty-six".