1664684572 has 12 divisors (see below), whose sum is σ = 2934157240. Its totient is φ = 826353936.

The previous prime is 1664684513. The next prime is 1664684573. The reversal of 1664684572 is 2754864661.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664684573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1496463 + ... + 1497574.

Almost surely, 2^1664684572 is an apocalyptic number.

It is an amenable number.

1664684572 is a deficient number, since it is larger than the sum of its proper divisors (1269472668).

1664684572 is a wasteful number, since it uses less digits than its factorization.

1664684572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2994180 (or 2994178 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 49.

The square root of 1664684572 is about 40800.5462218338. The cubic root of 1664684572 is about 1185.1609084374.

The spelling of 1664684572 in words is "one billion, six hundred sixty-four million, six hundred eighty-four thousand, five hundred seventy-two".