1664265613 has 8 divisors (see below), whose sum is σ = 1755436320. Its totient is φ = 1573452720.

The previous prime is 1664265611. The next prime is 1664265637. The reversal of 1664265613 is 3165624661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664265613 - 2¹ = 1664265611 is a prime.

It is a super-2 number, since 2×1664265613² = 5539560061228531538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664265611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79870 + ... + 98527.

It is an arithmetic number, because the mean of its divisors is an integer number (219429540).

Almost surely, 2^1664265613 is an apocalyptic number.

It is an amenable number.

1664265613 is a deficient number, since it is larger than the sum of its proper divisors (91170707).

1664265613 is a wasteful number, since it uses less digits than its factorization.

1664265613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178907.

The product of its digits is 155520, while the sum is 40.

The square root of 1664265613 is about 40795.4116660195. The cubic root of 1664265613 is about 1185.0614750876.

The spelling of 1664265613 in words is "one billion, six hundred sixty-four million, two hundred sixty-five thousand, six hundred thirteen".