64616654309 has 4 divisors (see below), whose sum is σ = 64617324780. Its totient is φ = 64615983840.

The previous prime is 64616654261. The next prime is 64616654353. The reversal of 64616654309 is 90345661646.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 48773397409 + 15843256900 = 220847^2 + 125870^2 .

It is a cyclic number.

It is not a de Polignac number, because 64616654309 - 2²⁸ = 64348218853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64616624309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160214 + ... + 393575.

It is an arithmetic number, because the mean of its divisors is an integer number (16154331195).

Almost surely, 2^64616654309 is an apocalyptic number.

It is an amenable number.

64616654309 is a deficient number, since it is larger than the sum of its proper divisors (670471).

64616654309 is a wasteful number, since it uses less digits than its factorization.

64616654309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670470.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 64616654309 in words is "sixty-four billion, six hundred sixteen million, six hundred fifty-four thousand, three hundred nine".