15161571666 has 12 divisors (see below), whose sum is σ = 32850071982. Its totient is φ = 5053857216.

The previous prime is 15161571661. The next prime is 15161571727. The reversal of 15161571666 is 66617516151.

It can be written as a sum of positive squares in only one way, i.e., 15134166441 + 27405225 = 123021^2 + 5235^2 .

It is not an unprimeable number, because it can be changed into a prime (15161571661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 421154751 + ... + 421154786.

Almost surely, 2^15161571666 is an apocalyptic number.

15161571666 is an abundant number, since it is smaller than the sum of its proper divisors (17688500316).

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

15161571666 is a wasteful number, since it uses less digits than its factorization.

15161571666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842309545 (or 842309542 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The spelling of 15161571666 in words is "fifteen billion, one hundred sixty-one million, five hundred seventy-one thousand, six hundred sixty-six".