7664657573 has 4 divisors (see below), whose sum is σ = 7928956140. Its totient is φ = 7400359008.

The previous prime is 7664657569. The next prime is 7664657579. The reversal of 7664657573 is 3757564667.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3170027809 + 4494629764 = 56303^2 + 67042^2 .

It is a cyclic number.

It is not a de Polignac number, because 7664657573 - 2² = 7664657569 is a prime.

It is a super-2 number, since 2×7664657573² (a number of 21 digits) 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 (7664657579) 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, 132149240 + ... + 132149297.

It is an arithmetic number, because the mean of its divisors is an integer number (1982239035).

Almost surely, 2^7664657573 is an apocalyptic number.

It is an amenable number.

7664657573 is a deficient number, since it is larger than the sum of its proper divisors (264298567).

7664657573 is a wasteful number, since it uses less digits than its factorization.

7664657573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264298566.

The product of its digits is 22226400, while the sum is 56.

The square root of 7664657573 is about 87548.0300920586. The cubic root of 7664657573 is about 1971.6549753332.

The spelling of 7664657573 in words is "seven billion, six hundred sixty-four million, six hundred fifty-seven thousand, five hundred seventy-three".