161561060115012 has 72 divisors (see below), whose sum is σ = 426154497088320. Its totient is φ = 51511263165120.

The previous prime is 161561060114969. The next prime is 161561060115017. The reversal of 161561060115012 is 210511060165161.

161561060115012 is a `hidden beast` number, since 1 + 6 + 15 + 6 + 10 + 601 + 15 + 0 + 12 = 666.

It is a super-2 number, since 2×161561060115012² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161561060115017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43369462 + ... + 46947122.

It is an arithmetic number, because the mean of its divisors is an integer number (5918812459560).

Almost surely, 2^{161561060115012} is an apocalyptic number.

161561060115012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161561060115012 is an abundant number, since it is smaller than the sum of its proper divisors (264593436973308).

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

161561060115012 is a wasteful number, since it uses less digits than its factorization.

161561060115012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632233 (or 3632228 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The spelling of 161561060115012 in words is "one hundred sixty-one trillion, five hundred sixty-one billion, sixty million, one hundred fifteen thousand, twelve".