65731671085 has 32 divisors (see below), whose sum is σ = 79927071840. Its totient is φ = 51892420608.

The previous prime is 65731671073. The next prime is 65731671133. The reversal of 65731671085 is 58017613756.

65731671085 is digitally balanced in base 11, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 2399922121 + 63331748964 = 48989^2 + 251658^2 .

It is a cyclic number.

It is not a de Polignac number, because 65731671085 - 2²¹ = 65729573933 is a prime.

65731671085 is strictly pandigital in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97669309 + ... + 97669981.

It is an arithmetic number, because the mean of its divisors is an integer number (2497720995).

Almost surely, 2^65731671085 is an apocalyptic number.

It is an amenable number.

65731671085 is a deficient number, since it is larger than the sum of its proper divisors (14195400755).

65731671085 is a wasteful number, since it uses less digits than its factorization.

65731671085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The spelling of 65731671085 in words is "sixty-five billion, seven hundred thirty-one million, six hundred seventy-one thousand, eighty-five".