65319917987 has 2 divisors, whose sum is σ = 65319917988. Its totient is φ = 65319917986.

The previous prime is 65319917977. The next prime is 65319918031. The reversal of 65319917987 is 78971991356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65319917987 - 2⁸ = 65319917731 is a prime.

It is a super-2 number, since 2×65319917987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65319917917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32659958993 + 32659958994.

It is an arithmetic number, because the mean of its divisors is an integer number (32659958994).

Almost surely, 2^65319917987 is an apocalyptic number.

65319917987 is a deficient number, since it is larger than the sum of its proper divisors (1).

65319917987 is an equidigital number, since it uses as much as digits as its factorization.

65319917987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25719120, while the sum is 65.

The spelling of 65319917987 in words is "sixty-five billion, three hundred nineteen million, nine hundred seventeen thousand, nine hundred eighty-seven".