6440507077 has 2 divisors, whose sum is σ = 6440507078. Its totient is φ = 6440507076.

The previous prime is 6440506999. The next prime is 6440507119. The reversal of 6440507077 is 7707050446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5069582401 + 1370924676 = 71201^2 + 37026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440507077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440507677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220253538 + 3220253539.

It is an arithmetic number, because the mean of its divisors is an integer number (3220253539).

Almost surely, 2^6440507077 is an apocalyptic number.

It is an amenable number.

6440507077 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440507077 is an equidigital number, since it uses as much as digits as its factorization.

6440507077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 40.

The square root of 6440507077 is about 80252.7699023529. The cubic root of 6440507077 is about 1860.5443233854.

The spelling of 6440507077 in words is "six billion, four hundred forty million, five hundred seven thousand, seventy-seven".