6656440425 has 12 divisors (see below), whose sum is σ = 11005314960. Its totient is φ = 3550101520.

The previous prime is 6656440403. The next prime is 6656440477. The reversal of 6656440425 is 5240446566.

It is not a de Polignac number, because 6656440425 - 2⁵ = 6656440393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44376195 + ... + 44376344.

It is an arithmetic number, because the mean of its divisors is an integer number (917109580).

Almost surely, 2^6656440425 is an apocalyptic number.

It is an amenable number.

6656440425 is a deficient number, since it is larger than the sum of its proper divisors (4348874535).

6656440425 is a wasteful number, since it uses less digits than its factorization.

6656440425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88752552 (or 88752547 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 42.

The square root of 6656440425 is about 81587.0113743603. The cubic root of 6656440425 is about 1881.1092391085.

The spelling of 6656440425 in words is "six billion, six hundred fifty-six million, four hundred forty thousand, four hundred twenty-five".