1664657553 has 16 divisors (see below), whose sum is σ = 2391854976. Its totient is φ = 1023728640.

The previous prime is 1664657537. The next prime is 1664657567. The reversal of 1664657553 is 3557564661.

It is not a de Polignac number, because 1664657553 - 2⁴ = 1664657537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1664657593) 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 15 ways as a sum of consecutive naturals, for example, 49393 + ... + 75953.

It is an arithmetic number, because the mean of its divisors is an integer number (149490936).

Almost surely, 2^1664657553 is an apocalyptic number.

1664657553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1664657553 is a deficient number, since it is larger than the sum of its proper divisors (727197423).

1664657553 is a wasteful number, since it uses less digits than its factorization.

1664657553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28184.

The product of its digits is 2268000, while the sum is 48.

The square root of 1664657553 is about 40800.2151097271. The cubic root of 1664657553 is about 1185.1544964047.

The spelling of 1664657553 in words is "one billion, six hundred sixty-four million, six hundred fifty-seven thousand, five hundred fifty-three".