7664628561 has 8 divisors (see below), whose sum is σ = 10220399520. Its totient is φ = 5109304992.

The previous prime is 7664628553. The next prime is 7664628599. The reversal of 7664628561 is 1658264667.

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

It is not a de Polignac number, because 7664628561 - 2³ = 7664628553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7664628661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69591 + ... + 142028.

It is an arithmetic number, because the mean of its divisors is an integer number (1277549940).

Almost surely, 2^7664628561 is an apocalyptic number.

It is an amenable number.

7664628561 is a deficient number, since it is larger than the sum of its proper divisors (2555770959).

7664628561 is a wasteful number, since it uses less digits than its factorization.

7664628561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223695.

The product of its digits is 2903040, while the sum is 51.

The square root of 7664628561 is about 87547.8643999955. The cubic root of 7664628561 is about 1971.6524876497.

The spelling of 7664628561 in words is "seven billion, six hundred sixty-four million, six hundred twenty-eight thousand, five hundred sixty-one".