181680742736 has 40 divisors (see below), whose sum is σ = 360755433984. Its totient is φ = 88589168640.

The previous prime is 181680742703. The next prime is 181680742753. The reversal of 181680742736 is 637247086181.

It is a happy number.

It is a super-2 number, since 2×181680742736² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235025 + ... + 646991.

Almost surely, 2^181680742736 is an apocalyptic number.

181680742736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181680742736 is a deficient number, since it is larger than the sum of its proper divisors (179074691248).

181680742736 is a wasteful number, since it uses less digits than its factorization.

181680742736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412659 (or 412653 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 181680742736 in words is "one hundred eighty-one billion, six hundred eighty million, seven hundred forty-two thousand, seven hundred thirty-six".