63507128639 has 2 divisors, whose sum is σ = 63507128640. Its totient is φ = 63507128638.

The previous prime is 63507128621. The next prime is 63507128687. The reversal of 63507128639 is 93682170536.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63507128639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63507128689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31753564319 + 31753564320.

It is an arithmetic number, because the mean of its divisors is an integer number (31753564320).

Almost surely, 2^63507128639 is an apocalyptic number.

63507128639 is a deficient number, since it is larger than the sum of its proper divisors (1).

63507128639 is an equidigital number, since it uses as much as digits as its factorization.

63507128639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 63507128639 in words is "sixty-three billion, five hundred seven million, one hundred twenty-eight thousand, six hundred thirty-nine".