49638157697 has 2 divisors, whose sum is σ = 49638157698. Its totient is φ = 49638157696.

The previous prime is 49638157669. The next prime is 49638157717. The reversal of 49638157697 is 79675183694.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28086743281 + 21551414416 = 167591^2 + 146804^2 .

It is a cyclic number.

It is not a de Polignac number, because 49638157697 - 2⁶ = 49638157633 is a prime.

It is not a weakly prime, because it can be changed into another prime (49638157627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24819078848 + 24819078849.

It is an arithmetic number, because the mean of its divisors is an integer number (24819078849).

Almost surely, 2^49638157697 is an apocalyptic number.

It is an amenable number.

49638157697 is a deficient number, since it is larger than the sum of its proper divisors (1).

49638157697 is an equidigital number, since it uses as much as digits as its factorization.

49638157697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68584320, while the sum is 65.

The spelling of 49638157697 in words is "forty-nine billion, six hundred thirty-eight million, one hundred fifty-seven thousand, six hundred ninety-seven".