15866720012 has 24 divisors (see below), whose sum is σ = 32621089872. Its totient is φ = 6657364800.

The previous prime is 15866719951. The next prime is 15866720057. The reversal of 15866720012 is 21002766851.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13868939 + ... + 13870082.

It is an arithmetic number, because the mean of its divisors is an integer number (1359212078).

Almost surely, 2^15866720012 is an apocalyptic number.

It is an amenable number.

15866720012 is an abundant number, since it is smaller than the sum of its proper divisors (16754369860).

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

15866720012 is a wasteful number, since it uses less digits than its factorization.

15866720012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27739049 (or 27739047 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 15866720012 in words is "fifteen billion, eight hundred sixty-six million, seven hundred twenty thousand, twelve".