138779361610 has 8 divisors (see below), whose sum is σ = 249802850916. Its totient is φ = 55511744640.

The previous prime is 138779361587. The next prime is 138779361619. The reversal of 138779361610 is 16163977831.

It can be written as a sum of positive squares in 2 ways, for example, as 115996779889 + 22782581721 = 340583^2 + 150939^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×138779361610² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138779361619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6938968071 + ... + 6938968090.

Almost surely, 2^138779361610 is an apocalyptic number.

138779361610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138779361610 is a deficient number, since it is larger than the sum of its proper divisors (111023489306).

138779361610 is a wasteful number, since it uses less digits than its factorization.

138779361610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13877936168.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 138779361610 in words is "one hundred thirty-eight billion, seven hundred seventy-nine million, three hundred sixty-one thousand, six hundred ten".