138660466240 has 56 divisors (see below), whose sum is σ = 331227071352. Its totient is φ = 55289180160.

The previous prime is 138660466237. The next prime is 138660466247. The reversal of 138660466240 is 42664066831.

It can be written as a sum of positive squares in 4 ways, for example, as 9934507584 + 128725958656 = 99672^2 + 358784^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138660466247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582021 + ... + 784900.

Almost surely, 2^138660466240 is an apocalyptic number.

138660466240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138660466240 is an abundant number, since it is smaller than the sum of its proper divisors (192566605112).

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

138660466240 is a wasteful number, since it uses less digits than its factorization.

138660466240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367255 (or 1367245 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 46.

The spelling of 138660466240 in words is "one hundred thirty-eight billion, six hundred sixty million, four hundred sixty-six thousand, two hundred forty".