138696983690 has 16 divisors (see below), whose sum is σ = 258263349480. Its totient is φ = 53565731520.

The previous prime is 138696983669. The next prime is 138696983723. The reversal of 138696983690 is 96389696831.

It can be written as a sum of positive squares in 4 ways, for example, as 135033465961 + 3663517729 = 367469^2 + 60527^2 .

It is a super-2 number, since 2×138696983690² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138696983690.

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, 239132441 + ... + 239133020.

Almost surely, 2^138696983690 is an apocalyptic number.

138696983690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138696983690 is a deficient number, since it is larger than the sum of its proper divisors (119566365790).

138696983690 is a wasteful number, since it uses less digits than its factorization.

138696983690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478265497.

The product of its (nonzero) digits is 90699264, while the sum is 68.

The spelling of 138696983690 in words is "one hundred thirty-eight billion, six hundred ninety-six million, nine hundred eighty-three thousand, six hundred ninety".