15940397025 has 90 divisors (see below), whose sum is σ = 34348094550. Its totient is φ = 7286993280.

The previous prime is 15940397009. The next prime is 15940397029. The reversal of 15940397025 is 52079304951.

It is a happy number.

15940397025 is a `hidden beast` number, since 1 + 594 + 0 + 39 + 7 + 0 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 3308435361 + 12631961664 = 57519^2 + 112392^2 .

It is not a de Polignac number, because 15940397025 - 2⁴ = 15940397009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (15940397029) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 18901 + ... + 179549.

It is an arithmetic number, because the mean of its divisors is an integer number (381645495).

Almost surely, 2^15940397025 is an apocalyptic number.

15940397025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15940397025 is an abundant number, since it is smaller than the sum of its proper divisors (18407697525).

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

15940397025 is a wasteful number, since it uses less digits than its factorization.

15940397025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160685 (or 160664 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The spelling of 15940397025 in words is "fifteen billion, nine hundred forty million, three hundred ninety-seven thousand, twenty-five".