138244818650 has 48 divisors (see below), whose sum is σ = 264146426880. Its totient is φ = 53790868800.

The previous prime is 138244818623. The next prime is 138244818661. The reversal of 138244818650 is 56818442831.

It is a super-2 number, since 2×138244818650² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14349335 + ... + 14358965.

It is an arithmetic number, because the mean of its divisors is an integer number (5503050560).

Almost surely, 2^138244818650 is an apocalyptic number.

138244818650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138244818650 is a deficient number, since it is larger than the sum of its proper divisors (125901608230).

138244818650 is a wasteful number, since it uses less digits than its factorization.

138244818650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17439 (or 17434 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 50.

The spelling of 138244818650 in words is "one hundred thirty-eight billion, two hundred forty-four million, eight hundred eighteen thousand, six hundred fifty".