138188812515 has 16 divisors (see below), whose sum is σ = 238109954208. Its totient is φ = 68031415296.

The previous prime is 138188812511. The next prime is 138188812523. The reversal of 138188812515 is 515218881831.

It is not a de Polignac number, because 138188812515 - 2² = 138188812511 is a prime.

It is a super-2 number, since 2×138188812515² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138188812511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354330094 + ... + 354330483.

It is an arithmetic number, because the mean of its divisors is an integer number (14881872138).

Almost surely, 2^138188812515 is an apocalyptic number.

138188812515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138188812515 is a deficient number, since it is larger than the sum of its proper divisors (99921141693).

138188812515 is a wasteful number, since it uses less digits than its factorization.

138188812515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708660598.

The product of its digits is 614400, while the sum is 51.

The spelling of 138188812515 in words is "one hundred thirty-eight billion, one hundred eighty-eight million, eight hundred twelve thousand, five hundred fifteen".