6665623425 has 36 divisors (see below), whose sum is σ = 12192910080. Its totient is φ = 3479355360.

The previous prime is 6665623403. The next prime is 6665623477. The reversal of 6665623425 is 5243265666.

It is not a de Polignac number, because 6665623425 - 2¹⁴ = 6665607041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 304585 + ... + 325734.

Almost surely, 2^6665623425 is an apocalyptic number.

It is an amenable number.

6665623425 is a deficient number, since it is larger than the sum of its proper divisors (5527286655).

6665623425 is a wasteful number, since it uses less digits than its factorization.

6665623425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630382 (or 630374 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The square root of 6665623425 is about 81643.2693184196. The cubic root of 6665623425 is about 1881.9738798412.

The spelling of 6665623425 in words is "six billion, six hundred sixty-five million, six hundred twenty-three thousand, four hundred twenty-five".