161858598720 has 896 divisors, whose sum is σ = 664618106880. Its totient is φ = 32456540160.

The previous prime is 161858598691. The next prime is 161858598877. The reversal of 161858598720 is 27895858161.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 159780934 + ... + 159781946.

It is an arithmetic number, because the mean of its divisors is an integer number (741761280).

Almost surely, 2^161858598720 is an apocalyptic number.

161858598720 is a gapful number since it is divisible by the number (10) 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 161858598720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332309053440).

161858598720 is an abundant number, since it is smaller than the sum of its proper divisors (502759508160).

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

161858598720 is a wasteful number, since it uses less digits than its factorization.

161858598720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 60.

The spelling of 161858598720 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, five hundred ninety-eight thousand, seven hundred twenty".