15645240666 has 64 divisors (see below), whose sum is σ = 38012976000. Its totient is φ = 4730342400.

The previous prime is 15645240629. The next prime is 15645240671. The reversal of 15645240666 is 66604254651.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237376 + ... + 296036.

It is an arithmetic number, because the mean of its divisors is an integer number (593952750).

Almost surely, 2^15645240666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15645240666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19006488000).

15645240666 is an abundant number, since it is smaller than the sum of its proper divisors (22367735334).

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

15645240666 is a wasteful number, since it uses less digits than its factorization.

15645240666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59132 (or 59126 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 15645240666 in words is "fifteen billion, six hundred forty-five million, two hundred forty thousand, six hundred sixty-six".