65719951729 has 2 divisors, whose sum is σ = 65719951730. Its totient is φ = 65719951728.

The previous prime is 65719951711. The next prime is 65719951741. The reversal of 65719951729 is 92715991756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61968634225 + 3751317504 = 248935^2 + 61248^2 .

It is a cyclic number.

It is not a de Polignac number, because 65719951729 - 2²³ = 65711563121 is a prime.

It is a super-2 number, since 2×65719951729² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65719955729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32859975864 + 32859975865.

It is an arithmetic number, because the mean of its divisors is an integer number (32859975865).

Almost surely, 2^65719951729 is an apocalyptic number.

It is an amenable number.

65719951729 is a deficient number, since it is larger than the sum of its proper divisors (1).

65719951729 is an equidigital number, since it uses as much as digits as its factorization.

65719951729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10716300, while the sum is 61.

The spelling of 65719951729 in words is "sixty-five billion, seven hundred nineteen million, nine hundred fifty-one thousand, seven hundred twenty-nine".