122158015398 has 24 divisors (see below), whose sum is σ = 265682081808. Its totient is φ = 40564510512.

The previous prime is 122158015391. The next prime is 122158015457. The reversal of 122158015398 is 893510851221.

122158015398 is a `hidden beast` number, since 1 + 2 + 21 + 580 + 15 + 39 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122158015391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12897465 + ... + 12906932.

It is an arithmetic number, because the mean of its divisors is an integer number (11070086742).

Almost surely, 2^122158015398 is an apocalyptic number.

122158015398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

122158015398 is an abundant number, since it is smaller than the sum of its proper divisors (143524066410).

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

122158015398 is a wasteful number, since it uses less digits than its factorization.

122158015398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25804668 (or 25804665 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 122158015398 in words is "one hundred twenty-two billion, one hundred fifty-eight million, fifteen thousand, three hundred ninety-eight".