65340891557 has 2 divisors, whose sum is σ = 65340891558. Its totient is φ = 65340891556.

The previous prime is 65340891493. The next prime is 65340891587. The reversal of 65340891557 is 75519804356.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53728458436 + 11612433121 = 231794^2 + 107761^2 .

It is a cyclic number.

It is not a de Polignac number, because 65340891557 - 2⁶ = 65340891493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65340891499 and 65340891508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65340891587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32670445778 + 32670445779.

It is an arithmetic number, because the mean of its divisors is an integer number (32670445779).

Almost surely, 2^65340891557 is an apocalyptic number.

It is an amenable number.

65340891557 is a deficient number, since it is larger than the sum of its proper divisors (1).

65340891557 is an equidigital number, since it uses as much as digits as its factorization.

65340891557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536000, while the sum is 53.

The spelling of 65340891557 in words is "sixty-five billion, three hundred forty million, eight hundred ninety-one thousand, five hundred fifty-seven".