1669939664 has 10 divisors (see below), whose sum is σ = 3235508130. Its totient is φ = 834969824.

The previous prime is 1669939643. The next prime is 1669939693. The reversal of 1669939664 is 4669399661.

It can be written as a sum of positive squares in only one way, i.e., 1237632400 + 432307264 = 35180^2 + 20792^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52185599 + ... + 52185630.

It is an arithmetic number, because the mean of its divisors is an integer number (323550813).

Almost surely, 2^1669939664 is an apocalyptic number.

It is an amenable number.

1669939664 is a deficient number, since it is larger than the sum of its proper divisors (1565568466).

1669939664 is a wasteful number, since it uses less digits than its factorization.

1669939664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104371237 (or 104371231 counting only the distinct ones).

The product of its digits is 11337408, while the sum is 59.

The square root of 1669939664 is about 40864.8952525270. The cubic root of 1669939664 is about 1186.4067074935.

The spelling of 1669939664 in words is "one billion, six hundred sixty-nine million, nine hundred thirty-nine thousand, six hundred sixty-four".