6638501497 has 2 divisors, whose sum is σ = 6638501498. Its totient is φ = 6638501496.

The previous prime is 6638501459. The next prime is 6638501539. The reversal of 6638501497 is 7941058366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4674593641 + 1963907856 = 68371^2 + 44316^2 .

It is a cyclic number.

It is not a de Polignac number, because 6638501497 - 2²³ = 6630112889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6638501497.

It is not a weakly prime, because it can be changed into another prime (6638508497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319250748 + 3319250749.

It is an arithmetic number, because the mean of its divisors is an integer number (3319250749).

Almost surely, 2^6638501497 is an apocalyptic number.

It is an amenable number.

6638501497 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638501497 is an equidigital number, since it uses as much as digits as its factorization.

6638501497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 6638501497 is about 81476.9998036256. Note that the first 3 decimals coincide. The cubic root of 6638501497 is about 1879.4178725250.

The spelling of 6638501497 in words is "six billion, six hundred thirty-eight million, five hundred one thousand, four hundred ninety-seven".