65999999999 has 2 divisors, whose sum is σ = 66000000000. Its totient is φ = 65999999998.

The previous prime is 65999999969. The next prime is 66000000013. The reversal of 65999999999 is 99999999956.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65999999999 - 2³² = 61705032703 is a prime.

65999999999 is a modest number, since divided by 999999 gives 65999 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65999999939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32999999999 + 33000000000.

It is an arithmetic number, because the mean of its divisors is an integer number (33000000000).

Almost surely, 2^65999999999 is an apocalyptic number.

65999999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

65999999999 is an equidigital number, since it uses as much as digits as its factorization.

65999999999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11622614670, while the sum is 92.

The spelling of 65999999999 in words is "sixty-five billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".