15661504002 has 32 divisors (see below), whose sum is σ = 31464367488. Its totient is φ = 5196986496.

The previous prime is 15661503953. The next prime is 15661504009. The reversal of 15661504002 is 20040516651.

It is not an unprimeable number, because it can be changed into a prime (15661504009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1540528 + ... + 1550660.

It is an arithmetic number, because the mean of its divisors is an integer number (983261484).

Almost surely, 2^15661504002 is an apocalyptic number.

15661504002 is an abundant number, since it is smaller than the sum of its proper divisors (15802863486).

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

15661504002 is a wasteful number, since it uses less digits than its factorization.

15661504002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11274.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 15661504002 in words is "fifteen billion, six hundred sixty-one million, five hundred four thousand, two".