138637656280 has 32 divisors (see below), whose sum is σ = 312720492240. Its totient is φ = 55315370880.

The previous prime is 138637656253. The next prime is 138637656341. The reversal of 138637656280 is 82656736831.

It is a super-2 number, since 2×138637656280² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

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, 4349286 + ... + 4381045.

Almost surely, 2^138637656280 is an apocalyptic number.

138637656280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138637656280 is an abundant number, since it is smaller than the sum of its proper divisors (174082835960).

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

138637656280 is a wasteful number, since it uses less digits than its factorization.

138637656280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730739 (or 8730735 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 138637656280 in words is "one hundred thirty-eight billion, six hundred thirty-seven million, six hundred fifty-six thousand, two hundred eighty".