1566872866 has 16 divisors (see below), whose sum is σ = 2612752128. Its totient is φ = 699843600.

The previous prime is 1566872863. The next prime is 1566872869. The reversal of 1566872866 is 6682786651.

It is an interprime number because it is at equal distance from previous prime (1566872863) and next prime (1566872869).

It is not an unprimeable number, because it can be changed into a prime (1566872863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971200 + ... + 972811.

It is an arithmetic number, because the mean of its divisors is an integer number (163297008).

Almost surely, 2^1566872866 is an apocalyptic number.

1566872866 is a deficient number, since it is larger than the sum of its proper divisors (1045879262).

1566872866 is a wasteful number, since it uses less digits than its factorization.

1566872866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944057.

The product of its digits is 5806080, while the sum is 55.

The square root of 1566872866 is about 39583.7449718947. The cubic root of 1566872866 is about 1161.4787092412.

The spelling of 1566872866 in words is "one billion, five hundred sixty-six million, eight hundred seventy-two thousand, eight hundred sixty-six".