161131556052 has 36 divisors (see below), whose sum is σ = 407359592640. Its totient is φ = 53703288912.

The previous prime is 161131555993. The next prime is 161131556063. The reversal of 161131556052 is 250655131161.

161131556052 is a `hidden beast` number, since 1 + 6 + 11 + 31 + 5 + 5 + 605 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 161131555998 and 161131556016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26652 + ... + 568307.

It is an arithmetic number, because the mean of its divisors is an integer number (11315544240).

Almost surely, 2^161131556052 is an apocalyptic number.

161131556052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161131556052 is an abundant number, since it is smaller than the sum of its proper divisors (246228036588).

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

161131556052 is a wasteful number, since it uses less digits than its factorization.

161131556052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602492 (or 602487 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 161131556052 in words is "one hundred sixty-one billion, one hundred thirty-one million, five hundred fifty-six thousand, fifty-two".