161106641172 has 48 divisors (see below), whose sum is σ = 426570789120. Its totient is φ = 52559611776.

The previous prime is 161106641147. The next prime is 161106641203. The reversal of 161106641172 is 271146601161.

161106641172 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 0 + 6 + 641 + 1 + 7 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15864373 + ... + 15874524.

It is an arithmetic number, because the mean of its divisors is an integer number (8886891440).

Almost surely, 2^161106641172 is an apocalyptic number.

161106641172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161106641172 is an abundant number, since it is smaller than the sum of its proper divisors (265464147948).

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

161106641172 is a wasteful number, since it uses less digits than its factorization.

161106641172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31738957 (or 31738949 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 161106641172 in words is "one hundred sixty-one billion, one hundred six million, six hundred forty-one thousand, one hundred seventy-two".