1664652013 has 4 divisors (see below), whose sum is σ = 1688097888. Its totient is φ = 1641206140.

The previous prime is 1664651999. The next prime is 1664652047. The reversal of 1664652013 is 3102564661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1664652013 - 2⁹ = 1664651501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664652013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664652083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11722831 + ... + 11722972.

It is an arithmetic number, because the mean of its divisors is an integer number (422024472).

Almost surely, 2^1664652013 is an apocalyptic number.

It is an amenable number.

1664652013 is a deficient number, since it is larger than the sum of its proper divisors (23445875).

1664652013 is an equidigital number, since it uses as much as digits as its factorization.

1664652013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23445874.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1664652013 is about 40800.1472178717. The cubic root of 1664652013 is about 1185.1531816672.

The spelling of 1664652013 in words is "one billion, six hundred sixty-four million, six hundred fifty-two thousand, thirteen".