6700621657 has 2 divisors, whose sum is σ = 6700621658. Its totient is φ = 6700621656.

The previous prime is 6700621607. The next prime is 6700621729. The reversal of 6700621657 is 7561260076.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4948278336 + 1752343321 = 70344^2 + 41861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6700621657 is a prime.

It is not a weakly prime, because it can be changed into another prime (6700621607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3350310828 + 3350310829.

It is an arithmetic number, because the mean of its divisors is an integer number (3350310829).

Almost surely, 2^6700621657 is an apocalyptic number.

It is an amenable number.

6700621657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6700621657 is an equidigital number, since it uses as much as digits as its factorization.

6700621657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 6700621657 is about 81857.3250051576. The cubic root of 6700621657 is about 1885.2619351896.

The spelling of 6700621657 in words is "six billion, seven hundred million, six hundred twenty-one thousand, six hundred fifty-seven".