15825971278020 has 96 divisors (see below), whose sum is σ = 47489072133888. Its totient is φ = 3927667594752.

The previous prime is 15825971277989. The next prime is 15825971278021. The reversal of 15825971278020 is 2087217952851.

It is a super-2 number, since 2×15825971278020² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15825971278021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154923199 + ... + 155025318.

It is an arithmetic number, because the mean of its divisors is an integer number (494677834728).

Almost surely, 2^{15825971278020} is an apocalyptic number.

15825971278020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15825971278020 is an abundant number, since it is smaller than the sum of its proper divisors (31663100855868).

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

15825971278020 is a wasteful number, since it uses less digits than its factorization.

15825971278020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309948589 (or 309948587 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 57.

The spelling of 15825971278020 in words is "fifteen trillion, eight hundred twenty-five billion, nine hundred seventy-one million, two hundred seventy-eight thousand, twenty".