161330639624 has 256 divisors, whose sum is σ = 408188160000. Its totient is φ = 57890764800.

The previous prime is 161330639623. The next prime is 161330639627. The reversal of 161330639624 is 426936033161.

It is a super-2 number, since 2×161330639624² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (161330639621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63539747 + ... + 63542285.

It is an arithmetic number, because the mean of its divisors is an integer number (1594485000).

Almost surely, 2^161330639624 is an apocalyptic number.

161330639624 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161330639624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204094080000).

161330639624 is an abundant number, since it is smaller than the sum of its proper divisors (246857520376).

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

161330639624 is a wasteful number, since it uses less digits than its factorization.

161330639624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732 (or 2728 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 44.

The spelling of 161330639624 in words is "one hundred sixty-one billion, three hundred thirty million, six hundred thirty-nine thousand, six hundred twenty-four".