64764312171761 has 6 divisors (see below), whose sum is σ = 66562006740390. Its totient is φ = 63013925354976.

The previous prime is 64764312171733. The next prime is 64764312171899. The reversal of 64764312171761 is 16717121346746.

It can be written as a sum of positive squares in 3 ways, for example, as 21042541456225 + 43721770715536 = 4587215^2 + 6612244^2 .

It is not a de Polignac number, because 64764312171761 - 2³⁰ = 64763238429937 is a prime.

It is a super-2 number, since 2×64764312171761² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64764312171697 and 64764312171706.

It is not an unprimeable number, because it can be changed into a prime (64764312171701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23653874516 + ... + 23653877253.

It is an arithmetic number, because the mean of its divisors is an integer number (11093667790065).

Almost surely, 2^{64764312171761} is an apocalyptic number.

It is an amenable number.

64764312171761 is a deficient number, since it is larger than the sum of its proper divisors (1797694568629).

64764312171761 is an equidigital number, since it uses as much as digits as its factorization.

64764312171761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47307751843 (or 47307751806 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 56.

The spelling of 64764312171761 in words is "sixty-four trillion, seven hundred sixty-four billion, three hundred twelve million, one hundred seventy-one thousand, seven hundred sixty-one".