15778125378 has 32 divisors (see below), whose sum is σ = 35556347520. Its totient is φ = 5185298160.

The previous prime is 15778125353. The next prime is 15778125413. The reversal of 15778125378 is 87352187751.

15778125378 is a `hidden beast` number, since 1 + 577 + 8 + 12 + 53 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2053825 + ... + 2061492.

It is an arithmetic number, because the mean of its divisors is an integer number (1111135860).

Almost surely, 2^15778125378 is an apocalyptic number.

15778125378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15778125378 is an abundant number, since it is smaller than the sum of its proper divisors (19778222142).

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

15778125378 is a wasteful number, since it uses less digits than its factorization.

15778125378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115399 (or 4115393 counting only the distinct ones).

The product of its digits is 3292800, while the sum is 54.

The spelling of 15778125378 in words is "fifteen billion, seven hundred seventy-eight million, one hundred twenty-five thousand, three hundred seventy-eight".