138590661798 has 32 divisors (see below), whose sum is σ = 308009349120. Its totient is φ = 46192372200.

The previous prime is 138590661793. The next prime is 138590661857. The reversal of 138590661798 is 897166095831.

138590661798 is a `hidden beast` number, since 1 + 3 + 8 + 5 + 9 + 0 + 6 + 617 + 9 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138590661793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457023 + ... + 697173.

It is an arithmetic number, because the mean of its divisors is an integer number (9625292160).

Almost surely, 2^138590661798 is an apocalyptic number.

138590661798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138590661798 is an abundant number, since it is smaller than the sum of its proper divisors (169418687322).

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

138590661798 is a wasteful number, since it uses less digits than its factorization.

138590661798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250849 (or 250843 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 138590661798 in words is "one hundred thirty-eight billion, five hundred ninety million, six hundred sixty-one thousand, seven hundred ninety-eight".