6640831523 has 2 divisors, whose sum is σ = 6640831524. Its totient is φ = 6640831522.

The previous prime is 6640831513. The next prime is 6640831543. The reversal of 6640831523 is 3251380466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6640831523 - 2¹⁶ = 6640765987 is a prime.

It is not a weakly prime, because it can be changed into another prime (6640831513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320415761 + 3320415762.

It is an arithmetic number, because the mean of its divisors is an integer number (3320415762).

Almost surely, 2^6640831523 is an apocalyptic number.

6640831523 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640831523 is an equidigital number, since it uses as much as digits as its factorization.

6640831523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 6640831523 is about 81491.2972224642. The cubic root of 6640831523 is about 1879.6377303888.

The spelling of 6640831523 in words is "six billion, six hundred forty million, eight hundred thirty-one thousand, five hundred twenty-three".