66652025665 has 4 divisors (see below), whose sum is σ = 79982430804. Its totient is φ = 53321620528.

The previous prime is 66652025653. The next prime is 66652025689. The reversal of 66652025665 is 56652025666.

It is a happy number.

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 15662772801 + 50989252864 = 125151^2 + 225808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66652025665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6665202562 + ... + 6665202571.

It is an arithmetic number, because the mean of its divisors is an integer number (19995607701).

Almost surely, 2^66652025665 is an apocalyptic number.

It is an amenable number.

66652025665 is a deficient number, since it is larger than the sum of its proper divisors (13330405139).

66652025665 is a wasteful number, since it uses less digits than its factorization.

66652025665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13330405138.

The product of its (nonzero) digits is 3888000, while the sum is 49.

Subtracting from 66652025665 its reverse (56652025666), we obtain a palindrome (9999999999).

The spelling of 66652025665 in words is "sixty-six billion, six hundred fifty-two million, twenty-five thousand, six hundred sixty-five".