65735239681 has 4 divisors (see below), whose sum is σ = 65739047764. Its totient is φ = 65731431600.

The previous prime is 65735239613. The next prime is 65735239697. The reversal of 65735239681 is 18693253756.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54550273600 + 11184966081 = 233560^2 + 105759^2 .

It is a cyclic number.

It is not a de Polignac number, because 65735239681 - 2²⁵ = 65701685249 is a prime.

It is a super-2 number, since 2×65735239681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65735209681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1878030 + ... + 1912711.

It is an arithmetic number, because the mean of its divisors is an integer number (16434761941).

Almost surely, 2^65735239681 is an apocalyptic number.

It is an amenable number.

65735239681 is a deficient number, since it is larger than the sum of its proper divisors (3808083).

65735239681 is a wasteful number, since it uses less digits than its factorization.

65735239681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808082.

The product of its digits is 8164800, while the sum is 55.

The spelling of 65735239681 in words is "sixty-five billion, seven hundred thirty-five million, two hundred thirty-nine thousand, six hundred eighty-one".