161551616650 has 48 divisors (see below), whose sum is σ = 302479640064. Its totient is φ = 64192412480.

The previous prime is 161551616621. The next prime is 161551616671. The reversal of 161551616650 is 56616155161.

It is a junction number, because it is equal to n+sod(n) for n = 161551616597 and 161551616606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15216744 + ... + 15227356.

It is an arithmetic number, because the mean of its divisors is an integer number (6301659168).

Almost surely, 2^161551616650 is an apocalyptic number.

161551616650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161551616650 is a deficient number, since it is larger than the sum of its proper divisors (140928023414).

161551616650 is a wasteful number, since it uses less digits than its factorization.

161551616650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12615 (or 12610 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 161551616650 in words is "one hundred sixty-one billion, five hundred fifty-one million, six hundred sixteen thousand, six hundred fifty".