64964720709 has 40 divisors (see below), whose sum is σ = 110933589888. Its totient is φ = 37114731360.

The previous prime is 64964720687. The next prime is 64964720783. The reversal of 64964720709 is 90702746946.

It is a happy number.

It is not a de Polignac number, because 64964720709 - 2⁵ = 64964720677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64964720209) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3532879 + ... + 3551219.

Almost surely, 2^64964720709 is an apocalyptic number.

It is an amenable number.

64964720709 is a deficient number, since it is larger than the sum of its proper divisors (45968869179).

64964720709 is a wasteful number, since it uses less digits than its factorization.

64964720709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24607 (or 24598 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 64964720709 in words is "sixty-four billion, nine hundred sixty-four million, seven hundred twenty thousand, seven hundred nine".