6656140424 has 16 divisors (see below), whose sum is σ = 13214396700. Its totient is φ = 3132301312.

The previous prime is 6656140399. The next prime is 6656140427. The reversal of 6656140424 is 4240416566.

It can be written as a sum of positive squares in 2 ways, for example, as 6645184324 + 10956100 = 81518^2 + 3310^2 .

It is not an unprimeable number, because it can be changed into a prime (6656140427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24470969 + ... + 24471240.

Almost surely, 2^6656140424 is an apocalyptic number.

It is an amenable number.

6656140424 is a deficient number, since it is larger than the sum of its proper divisors (6558256276).

6656140424 is a wasteful number, since it uses less digits than its factorization.

6656140424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48942232 (or 48942228 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 6656140424 is about 81585.1728195755. The cubic root of 6656140424 is about 1881.0809786021.

The spelling of 6656140424 in words is "six billion, six hundred fifty-six million, one hundred forty thousand, four hundred twenty-four".