138669491268 has 240 divisors, whose sum is σ = 471612201984. Its totient is φ = 34451904960.

The previous prime is 138669491243. The next prime is 138669491297. The reversal of 138669491268 is 862194966831.

138669491268 is a `hidden beast` number, since 1 + 3 + 86 + 6 + 9 + 491 + 2 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 452971 + ... + 694637.

Almost surely, 2^138669491268 is an apocalyptic number.

138669491268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138669491268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235806100992).

138669491268 is an abundant number, since it is smaller than the sum of its proper divisors (332942710716).

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

138669491268 is a wasteful number, since it uses less digits than its factorization.

138669491268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241724 (or 241713 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The spelling of 138669491268 in words is "one hundred thirty-eight billion, six hundred sixty-nine million, four hundred ninety-one thousand, two hundred sixty-eight".