161640124085200 has 30 divisors (see below), whose sum is σ = 388340398115654. Its totient is φ = 64656049633920.

The previous prime is 161640124085179. The next prime is 161640124085201. The reversal of 161640124085200 is 2580421046161.

It can be written as a sum of positive squares in 3 ways, for example, as 25450459024 + 161614673626176 = 159532^2 + 12712776^2 .

It is a super-2 number, since 2×161640124085200² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161640124085201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202050154707 + ... + 202050155506.

Almost surely, 2^{161640124085200} is an apocalyptic number.

161640124085200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161640124085200 is an abundant number, since it is smaller than the sum of its proper divisors (226700274030454).

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

161640124085200 is a wasteful number, since it uses less digits than its factorization.

161640124085200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404100310231 (or 404100310220 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 161640124085200 in words is "one hundred sixty-one trillion, six hundred forty billion, one hundred twenty-four million, eighty-five thousand, two hundred".