161634012640 has 48 divisors (see below), whose sum is σ = 386694060480. Its totient is φ = 63835200000.

The previous prime is 161634012629. The next prime is 161634012667. The reversal of 161634012640 is 46210436161.

It is a super-2 number, since 2×161634012640² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161634012596 and 161634012605.

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, 6381111 + ... + 6406390.

It is an arithmetic number, because the mean of its divisors is an integer number (8056126260).

Almost surely, 2^161634012640 is an apocalyptic number.

161634012640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161634012640 is an abundant number, since it is smaller than the sum of its proper divisors (225060047840).

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

161634012640 is a wasteful number, since it uses less digits than its factorization.

161634012640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12787595 (or 12787587 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 161634012640 in words is "one hundred sixty-one billion, six hundred thirty-four million, twelve thousand, six hundred forty".