15672651666 has 32 divisors (see below), whose sum is σ = 36554294400. Its totient is φ = 4477899888.

The previous prime is 15672651661. The next prime is 15672651703. The reversal of 15672651666 is 66615627651.

It is not an unprimeable number, because it can be changed into a prime (15672651661) 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, 3805681 + ... + 3809796.

It is an arithmetic number, because the mean of its divisors is an integer number (1142321700).

Almost surely, 2^15672651666 is an apocalyptic number.

15672651666 is an abundant number, since it is smaller than the sum of its proper divisors (20881642734).

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

15672651666 is an equidigital number, since it uses as much as digits as its factorization.

15672651666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7615503 (or 7615489 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 51.

The spelling of 15672651666 in words is "fifteen billion, six hundred seventy-two million, six hundred fifty-one thousand, six hundred sixty-six".