161007326500 has 24 divisors (see below), whose sum is σ = 351640002168. Its totient is φ = 64402930400.

The previous prime is 161007326497. The next prime is 161007326503. The reversal of 161007326500 is 5623700161.

It is an interprime number because it is at equal distance from previous prime (161007326497) and next prime (161007326503).

It can be written as a sum of positive squares in 4 ways, for example, as 25942256356 + 135065070144 = 161066^2 + 367512^2 .

It is not an unprimeable number, because it can be changed into a prime (161007326503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161006827 + ... + 161007826.

It is an arithmetic number, because the mean of its divisors is an integer number (14651666757).

Almost surely, 2^161007326500 is an apocalyptic number.

161007326500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161007326500 is an abundant number, since it is smaller than the sum of its proper divisors (190632675668).

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

161007326500 is a wasteful number, since it uses less digits than its factorization.

161007326500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322014672 (or 322014660 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The spelling of 161007326500 in words is "one hundred sixty-one billion, seven million, three hundred twenty-six thousand, five hundred".