15381977685 has 16 divisors (see below), whose sum is σ = 24736098816. Its totient is φ = 8162076608.

The previous prime is 15381977671. The next prime is 15381977701. The reversal of 15381977685 is 58677918351.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 15381977685 - 2⁴ = 15381977669 is a prime.

It is a congruent number.

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, 2599749 + ... + 2605658.

It is an arithmetic number, because the mean of its divisors is an integer number (1546006176).

Almost surely, 2^15381977685 is an apocalyptic number.

15381977685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15381977685 is a deficient number, since it is larger than the sum of its proper divisors (9354121131).

15381977685 is a wasteful number, since it uses less digits than its factorization.

15381977685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205612.

The product of its digits is 12700800, while the sum is 60.

The spelling of 15381977685 in words is "fifteen billion, three hundred eighty-one million, nine hundred seventy-seven thousand, six hundred eighty-five".