123139693291520 has 96 divisors (see below), whose sum is σ = 298077832339560. Its totient is φ = 48819984138240.

The previous prime is 123139693291469. The next prime is 123139693291529. The reversal of 123139693291520 is 25192396931321.

It can be written as a sum of positive squares in 4 ways, for example, as 101916939633664 + 21222753657856 = 10095392^2 + 4606816^2 .

It is not an unprimeable number, because it can be changed into a prime (123139693291529) 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, 52052441 + ... + 54366680.

Almost surely, 2^{123139693291520} is an apocalyptic number.

123139693291520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123139693291520 is an abundant number, since it is smaller than the sum of its proper divisors (174938139048040).

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

123139693291520 is a wasteful number, since it uses less digits than its factorization.

123139693291520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106419261 (or 106419241 counting only the distinct ones).

The product of its (nonzero) digits is 4723920, while the sum is 56.

The spelling of 123139693291520 in words is "one hundred twenty-three trillion, one hundred thirty-nine billion, six hundred ninety-three million, two hundred ninety-one thousand, five hundred twenty".