181669672536 has 64 divisors (see below), whose sum is σ = 496298689920. Its totient is φ = 54958533120.

The previous prime is 181669672531. The next prime is 181669672553. The reversal of 181669672536 is 635276966181.

It is a self number, because there is not a number n which added to its sum of digits gives 181669672536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181669672531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423670 + ... + 736773.

It is an arithmetic number, because the mean of its divisors is an integer number (7754667030).

Almost surely, 2^181669672536 is an apocalyptic number.

It is an amenable number.

181669672536 is an abundant number, since it is smaller than the sum of its proper divisors (314629017384).

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

181669672536 is a wasteful number, since it uses less digits than its factorization.

181669672536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161056 (or 1161052 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 60.

The spelling of 181669672536 in words is "one hundred eighty-one billion, six hundred sixty-nine million, six hundred seventy-two thousand, five hundred thirty-six".