161601566116650 has 192 divisors, whose sum is σ = 483050791627776. Its totient is φ = 35268542848000.

The previous prime is 161601566116649. The next prime is 161601566116709. The reversal of 161601566116650 is 56611665106161.

It is a super-2 number, since 2×161601566116650² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161601566116593 and 161601566116602.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 124598256 + ... + 125888555.

It is an arithmetic number, because the mean of its divisors is an integer number (2515889539728).

Almost surely, 2^{161601566116650} is an apocalyptic number.

161601566116650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161601566116650 is an abundant number, since it is smaller than the sum of its proper divisors (321449225511126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161601566116650 is a wasteful number, since it uses less digits than its factorization.

161601566116650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250486877 (or 250486872 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 51.

The spelling of 161601566116650 in words is "one hundred sixty-one trillion, six hundred one billion, five hundred sixty-six million, one hundred sixteen thousand, six hundred fifty".