64777713013 has 6 divisors (see below), whose sum is σ = 70143914274. Its totient is φ = 59794811856.

The previous prime is 64777712929. The next prime is 64777713017. The reversal of 64777713013 is 31031777746.

It can be written as a sum of positive squares in 3 ways, for example, as 1385551729 + 63392161284 = 37223^2 + 251778^2 .

It is not a de Polignac number, because 64777713013 - 2⁹ = 64777712501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64777713017) 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, 191649870 + ... + 191650207.

It is an arithmetic number, because the mean of its divisors is an integer number (11690652379).

Almost surely, 2^64777713013 is an apocalyptic number.

It is an amenable number.

64777713013 is a deficient number, since it is larger than the sum of its proper divisors (5366201261).

64777713013 is a wasteful number, since it uses less digits than its factorization.

64777713013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383300103 (or 383300090 counting only the distinct ones).

The product of its (nonzero) digits is 518616, while the sum is 46.

The spelling of 64777713013 in words is "sixty-four billion, seven hundred seventy-seven million, seven hundred thirteen thousand, thirteen".