137861026640 has 40 divisors (see below), whose sum is σ = 334462843008. Its totient is φ = 52746826880.

The previous prime is 137861026579. The next prime is 137861026643. The reversal of 137861026640 is 46620168731.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 137861026591 and 137861026600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137861026643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37460396 + ... + 37464075.

Almost surely, 2^137861026640 is an apocalyptic number.

137861026640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

137861026640 is an abundant number, since it is smaller than the sum of its proper divisors (196601816368).

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

137861026640 is a wasteful number, since it uses less digits than its factorization.

137861026640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74924507 (or 74924501 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 137861026640 in words is "one hundred thirty-seven billion, eight hundred sixty-one million, twenty-six thousand, six hundred forty".