1664705492 has 6 divisors (see below), whose sum is σ = 2913234618. Its totient is φ = 832352744.

The previous prime is 1664705479. The next prime is 1664705507. The reversal of 1664705492 is 2945074661.

It can be written as a sum of positive squares in only one way, i.e., 1664313616 + 391876 = 40796^2 + 626^2 .

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, 208088183 + ... + 208088190.

It is an arithmetic number, because the mean of its divisors is an integer number (485539103).

Almost surely, 2^1664705492 is an apocalyptic number.

It is an amenable number.

1664705492 is a deficient number, since it is larger than the sum of its proper divisors (1248529126).

1664705492 is a wasteful number, since it uses less digits than its factorization.

1664705492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416176377 (or 416176375 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 1664705492 is about 40800.8025901452. The cubic root of 1664705492 is about 1185.1658730340.

The spelling of 1664705492 in words is "one billion, six hundred sixty-four million, seven hundred five thousand, four hundred ninety-two".