15157212393978 has 48 divisors (see below), whose sum is σ = 34058817680160. Its totient is φ = 5052126519216.

The previous prime is 15157212393931. The next prime is 15157212393979. The reversal of 15157212393978 is 87939321275151.

15157212393978 is a `hidden beast` number, since 1 + 5 + 1 + 5 + 7 + 2 + 1 + 239 + 397 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (15157212393979) 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, 8093313 + ... + 9788571.

It is an arithmetic number, because the mean of its divisors is an integer number (709558701670).

Almost surely, 2^{15157212393978} is an apocalyptic number.

15157212393978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15157212393978 is an abundant number, since it is smaller than the sum of its proper divisors (18901605286182).

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

15157212393978 is a wasteful number, since it uses less digits than its factorization.

15157212393978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713673 (or 1713661 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 63.

The spelling of 15157212393978 in words is "fifteen trillion, one hundred fifty-seven billion, two hundred twelve million, three hundred ninety-three thousand, nine hundred seventy-eight".