15661325242 has 64 divisors (see below), whose sum is σ = 26384279040. Its totient is φ = 6936652800.

The previous prime is 15661325237. The next prime is 15661325243. The reversal of 15661325242 is 24252316651.

It is not an unprimeable number, because it can be changed into a prime (15661325243) 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, 15338692 + ... + 15339712.

It is an arithmetic number, because the mean of its divisors is an integer number (412254360).

Almost surely, 2^15661325242 is an apocalyptic number.

15661325242 is a deficient number, since it is larger than the sum of its proper divisors (10722953798).

15661325242 is a wasteful number, since it uses less digits than its factorization.

15661325242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447.

The product of its digits is 86400, while the sum is 37.

The spelling of 15661325242 in words is "fifteen billion, six hundred sixty-one million, three hundred twenty-five thousand, two hundred forty-two".