7664428663 has 4 divisors (see below), whose sum is σ = 7667342208. Its totient is φ = 7661515120.

The previous prime is 7664428657. The next prime is 7664428789. The reversal of 7664428663 is 3668244667.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 7664428663 - 2²⁵ = 7630874231 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 7664428663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664428643) 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, 1452823 + ... + 1458088.

It is an arithmetic number, because the mean of its divisors is an integer number (1916835552).

Almost surely, 2^7664428663 is an apocalyptic number.

7664428663 is a deficient number, since it is larger than the sum of its proper divisors (2913545).

7664428663 is a wasteful number, since it uses less digits than its factorization.

7664428663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913544.

The product of its digits is 6967296, while the sum is 52.

The square root of 7664428663 is about 87546.7227427732. The cubic root of 7664428663 is about 1971.6353468836.

The spelling of 7664428663 in words is "seven billion, six hundred sixty-four million, four hundred twenty-eight thousand, six hundred sixty-three".