15378778780398 has 64 divisors (see below), whose sum is σ = 37985319878400. Its totient is φ = 4572307003680.

The previous prime is 15378778780357. The next prime is 15378778780429. The reversal of 15378778780398 is 89308787787351.

15378778780398 is a `hidden beast` number, since 1 + 5 + 3 + 7 + 8 + 77 + 87 + 80 + 398 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 244215688 + ... + 244278651.

It is an arithmetic number, because the mean of its divisors is an integer number (593520623100).

Almost surely, 2^{15378778780398} is an apocalyptic number.

15378778780398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15378778780398 is an abundant number, since it is smaller than the sum of its proper divisors (22606541098002).

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

15378778780398 is a wasteful number, since it uses less digits than its factorization.

15378778780398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488494414 (or 488494408 counting only the distinct ones).

The product of its (nonzero) digits is 3982970880, while the sum is 81.

The spelling of 15378778780398 in words is "fifteen trillion, three hundred seventy-eight billion, seven hundred seventy-eight million, seven hundred eighty thousand, three hundred ninety-eight".