65431685641 has 16 divisors (see below), whose sum is σ = 75965587456. Its totient is φ = 55195967376.

The previous prime is 65431685629. The next prime is 65431685681. The reversal of 65431685641 is 14658613456.

It is a cyclic number.

It is not a de Polignac number, because 65431685641 - 2⁷ = 65431685513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65431685681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445630 + ... + 573976.

It is an arithmetic number, because the mean of its divisors is an integer number (4747849216).

Almost surely, 2^65431685641 is an apocalyptic number.

It is an amenable number.

65431685641 is a deficient number, since it is larger than the sum of its proper divisors (10533901815).

65431685641 is a wasteful number, since it uses less digits than its factorization.

65431685641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129508.

The product of its digits is 2073600, while the sum is 49.

The spelling of 65431685641 in words is "sixty-five billion, four hundred thirty-one million, six hundred eighty-five thousand, six hundred forty-one".