181662557080372 has 12 divisors (see below), whose sum is σ = 317911550048260. Its totient is φ = 90830685638016.

The previous prime is 181662557080363. The next prime is 181662557080577. The reversal of 181662557080372 is 273080755266181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 45147729270436 + 136514827809936 = 6719206^2 + 11683956^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 181662557080372.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147535797 + ... + 148762012.

Almost surely, 2^{181662557080372} is an apocalyptic number.

It is an amenable number.

181662557080372 is a deficient number, since it is larger than the sum of its proper divisors (136248992967888).

181662557080372 is a wasteful number, since it uses less digits than its factorization.

181662557080372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296451090 (or 296451088 counting only the distinct ones).

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 181662557080372 in words is "one hundred eighty-one trillion, six hundred sixty-two billion, five hundred fifty-seven million, eighty thousand, three hundred seventy-two".