64366765685 has 8 divisors (see below), whose sum is σ = 77244793560. Its totient is φ = 51490296064.

The previous prime is 64366765669. The next prime is 64366765693. The reversal of 64366765685 is 58656766346.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8205823396 + 56160942289 = 90586^2 + 236983^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64366765685 - 2⁴ = 64366765669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296672 + ... + 465561.

It is an arithmetic number, because the mean of its divisors is an integer number (9655599195).

Almost surely, 2^64366765685 is an apocalyptic number.

It is an amenable number.

64366765685 is a deficient number, since it is larger than the sum of its proper divisors (12878027875).

64366765685 is a wasteful number, since it uses less digits than its factorization.

64366765685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779127.

The product of its digits is 130636800, while the sum is 62.

The spelling of 64366765685 in words is "sixty-four billion, three hundred sixty-six million, seven hundred sixty-five thousand, six hundred eighty-five".