64894776653 has 6 divisors (see below), whose sum is σ = 75489842286. Its totient is φ = 55624094232.

The previous prime is 64894776643. The next prime is 64894776701. The reversal of 64894776653 is 35667749846.

It can be written as a sum of positive squares in only one way, i.e., 56874141289 + 8020635364 = 238483^2 + 89558^2 .

It is not a de Polignac number, because 64894776653 - 2²² = 64890582349 is a prime.

It is a super-2 number, since 2×64894776653² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64894776653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64894776643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 662191550 + ... + 662191647.

It is an arithmetic number, because the mean of its divisors is an integer number (12581640381).

Almost surely, 2^64894776653 is an apocalyptic number.

It is an amenable number.

64894776653 is a deficient number, since it is larger than the sum of its proper divisors (10595065633).

64894776653 is a wasteful number, since it uses less digits than its factorization.

64894776653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324383211 (or 1324383204 counting only the distinct ones).

The product of its digits is 182891520, while the sum is 65.

The spelling of 64894776653 in words is "sixty-four billion, eight hundred ninety-four million, seven hundred seventy-six thousand, six hundred fifty-three".