6625731613 has 2 divisors, whose sum is σ = 6625731614. Its totient is φ = 6625731612.

The previous prime is 6625731571. The next prime is 6625731653. The reversal of 6625731613 is 3161375266.

6625731613 = 57557² + 57558².

It is an a-pointer prime, because the next prime (6625731653) can be obtained adding 6625731613 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3312923364 + 3312808249 = 57558^2 + 57557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6625731613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6625731653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312865806 + 3312865807.

It is an arithmetic number, because the mean of its divisors is an integer number (3312865807).

Almost surely, 2^6625731613 is an apocalyptic number.

6625731613 is the 57558-th centered square number.

It is an amenable number.

6625731613 is a deficient number, since it is larger than the sum of its proper divisors (1).

6625731613 is an equidigital number, since it uses as much as digits as its factorization.

6625731613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The square root of 6625731613 is about 81398.5971193607. The cubic root of 6625731613 is about 1878.2120103517.

The spelling of 6625731613 in words is "six billion, six hundred twenty-five million, seven hundred thirty-one thousand, six hundred thirteen".