7713662561 has 4 divisors (see below), whose sum is σ = 8414904624. Its totient is φ = 7012420500.

The previous prime is 7713662557. The next prime is 7713662563. The reversal of 7713662561 is 1652663177.

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 7713662561 - 2² = 7713662557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7713662563) 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, 350621015 + ... + 350621036.

It is an arithmetic number, because the mean of its divisors is an integer number (2103726156).

Almost surely, 2^7713662561 is an apocalyptic number.

It is an amenable number.

7713662561 is a deficient number, since it is larger than the sum of its proper divisors (701242063).

7713662561 is a wasteful number, since it uses less digits than its factorization.

7713662561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701242062.

The product of its digits is 317520, while the sum is 44.

The square root of 7713662561 is about 87827.4590375926. The cubic root of 7713662561 is about 1975.8480627308.

The spelling of 7713662561 in words is "seven billion, seven hundred thirteen million, six hundred sixty-two thousand, five hundred sixty-one".