15561607425 has 144 divisors (see below), whose sum is σ = 32366803392. Its totient is φ = 6539097600.

The previous prime is 15561607423. The next prime is 15561607493. The reversal of 15561607425 is 52470616551.

It is not a de Polignac number, because 15561607425 - 2¹ = 15561607423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15561607423) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 14666395 + ... + 14667455.

It is an arithmetic number, because the mean of its divisors is an integer number (224769468).

Almost surely, 2^15561607425 is an apocalyptic number.

15561607425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15561607425 is an abundant number, since it is smaller than the sum of its proper divisors (16805195967).

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

15561607425 is a wasteful number, since it uses less digits than its factorization.

15561607425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408 (or 1396 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 15561607425 in words is "fifteen billion, five hundred sixty-one million, six hundred seven thousand, four hundred twenty-five".