65131981699 has 2 divisors, whose sum is σ = 65131981700. Its totient is φ = 65131981698.

The previous prime is 65131981657. The next prime is 65131981709. The reversal of 65131981699 is 99618913156.

65131981699 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65131981699 - 2¹³ = 65131973507 is a prime.

It is not a weakly prime, because it can be changed into another prime (65131981609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32565990849 + 32565990850.

It is an arithmetic number, because the mean of its divisors is an integer number (32565990850).

Almost surely, 2^65131981699 is an apocalyptic number.

65131981699 is a deficient number, since it is larger than the sum of its proper divisors (1).

65131981699 is an equidigital number, since it uses as much as digits as its factorization.

65131981699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 58.

The spelling of 65131981699 in words is "sixty-five billion, one hundred thirty-one million, nine hundred eighty-one thousand, six hundred ninety-nine".