1566220664 has 16 divisors (see below), whose sum is σ = 3008290320. Its totient is φ = 764009920.

The previous prime is 1566220651. The next prime is 1566220679. The reversal of 1566220664 is 4660226651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2387204 + ... + 2387859.

It is an arithmetic number, because the mean of its divisors is an integer number (188018145).

Almost surely, 2^1566220664 is an apocalyptic number.

It is an amenable number.

1566220664 is a deficient number, since it is larger than the sum of its proper divisors (1442069656).

1566220664 is a wasteful number, since it uses less digits than its factorization.

1566220664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775110 (or 4775106 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 1566220664 is about 39575.5058590538. The cubic root of 1566220664 is about 1161.3175338873.

The spelling of 1566220664 in words is "one billion, five hundred sixty-six million, two hundred twenty thousand, six hundred sixty-four".