6645578025 has 96 divisors (see below), whose sum is σ = 11714107392. Its totient is φ = 3317529600.

The previous prime is 6645577963. The next prime is 6645578063. The reversal of 6645578025 is 5208755466.

It is a happy number.

It is not a de Polignac number, because 6645578025 - 2¹⁴ = 6645561641 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20077110 + ... + 20077440.

It is an arithmetic number, because the mean of its divisors is an integer number (122021952).

Almost surely, 2^6645578025 is an apocalyptic number.

It is an amenable number.

6645578025 is a deficient number, since it is larger than the sum of its proper divisors (5068529367).

6645578025 is a wasteful number, since it uses less digits than its factorization.

6645578025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 48.

The square root of 6645578025 is about 81520.4147744600. The cubic root of 6645578025 is about 1880.0854443775.

The spelling of 6645578025 in words is "six billion, six hundred forty-five million, five hundred seventy-eight thousand, twenty-five".