7643625665 has 16 divisors (see below), whose sum is σ = 9965341008. Its totient is φ = 5594566656.

The previous prime is 7643625637. The next prime is 7643625677. The reversal of 7643625665 is 5665263467.

It can be written as a sum of positive squares in 8 ways, for example, as 2839610944 + 4804014721 = 53288^2 + 69311^2 .

It is a cyclic number.

It is not a de Polignac number, because 7643625665 - 2¹² = 7643621569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512984 + ... + 527673.

It is an arithmetic number, because the mean of its divisors is an integer number (622833813).

Almost surely, 2^7643625665 is an apocalyptic number.

It is an amenable number.

7643625665 is a deficient number, since it is larger than the sum of its proper divisors (2321715343).

7643625665 is a wasteful number, since it uses less digits than its factorization.

7643625665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040788.

The product of its digits is 5443200, while the sum is 50.

The square root of 7643625665 is about 87427.8311809232. The cubic root of 7643625665 is about 1969.8499086867.

The spelling of 7643625665 in words is "seven billion, six hundred forty-three million, six hundred twenty-five thousand, six hundred sixty-five".