1556665166 has 16 divisors (see below), whose sum is σ = 2700722304. Its totient is φ = 659103864.

The previous prime is 1556665157. The next prime is 1556665189. The reversal of 1556665166 is 6615666551.

It is a self number, because there is not a number n which added to its sum of digits gives 1556665166.

It is a congruent number.

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, 668660 + ... + 670983.

It is an arithmetic number, because the mean of its divisors is an integer number (168795144).

Almost surely, 2^1556665166 is an apocalyptic number.

1556665166 is a deficient number, since it is larger than the sum of its proper divisors (1144057138).

1556665166 is a wasteful number, since it uses less digits than its factorization.

1556665166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339735.

The product of its digits is 972000, while the sum is 47.

The square root of 1556665166 is about 39454.5962594981. The cubic root of 1556665166 is about 1158.9509853478.

The spelling of 1556665166 in words is "one billion, five hundred fifty-six million, six hundred sixty-five thousand, one hundred sixty-six".