137835639891 has 12 divisors (see below), whose sum is σ = 199277429832. Its totient is φ = 91806654816.

The previous prime is 137835639841. The next prime is 137835639899. The reversal of 137835639891 is 198936538731.

137835639891 is a `hidden beast` number, since 1 + 37 + 83 + 56 + 398 + 91 = 666.

It is not a de Polignac number, because 137835639891 - 2⁷ = 137835639763 is a prime.

It is a super-2 number, since 2×137835639891² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (137835639899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6970561 + ... + 6990306.

It is an arithmetic number, because the mean of its divisors is an integer number (16606452486).

Almost surely, 2^137835639891 is an apocalyptic number.

137835639891 is a deficient number, since it is larger than the sum of its proper divisors (61441789941).

137835639891 is a wasteful number, since it uses less digits than its factorization.

137835639891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13961970 (or 13961967 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The spelling of 137835639891 in words is "one hundred thirty-seven billion, eight hundred thirty-five million, six hundred thirty-nine thousand, eight hundred ninety-one".