139668439815 has 24 divisors (see below), whose sum is σ = 242148095280. Its totient is φ = 74472562944.

The previous prime is 139668439811. The next prime is 139668439847. The reversal of 139668439815 is 518934866931.

139668439815 is a `hidden beast` number, since 139 + 6 + 68 + 439 + 8 + 1 + 5 = 666.

It is not a de Polignac number, because 139668439815 - 2² = 139668439811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139668439811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162402 + ... + 552911.

It is an arithmetic number, because the mean of its divisors is an integer number (10089503970).

Almost surely, 2^139668439815 is an apocalyptic number.

139668439815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139668439815 is a deficient number, since it is larger than the sum of its proper divisors (102479655465).

139668439815 is a wasteful number, since it uses less digits than its factorization.

139668439815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719663 (or 719660 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 63.

The spelling of 139668439815 in words is "one hundred thirty-nine billion, six hundred sixty-eight million, four hundred thirty-nine thousand, eight hundred fifteen".