64949897273 has 4 divisors (see below), whose sum is σ = 66705299940. Its totient is φ = 63194494608.

The previous prime is 64949897263. The next prime is 64949897279. The reversal of 64949897273 is 37279894946.

64949897273 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32821844224 + 32128053049 = 181168^2 + 179243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64949897273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64949897279) 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, 877701278 + ... + 877701351.

It is an arithmetic number, because the mean of its divisors is an integer number (16676324985).

Almost surely, 2^64949897273 is an apocalyptic number.

It is an amenable number.

64949897273 is a deficient number, since it is larger than the sum of its proper divisors (1755402667).

64949897273 is a wasteful number, since it uses less digits than its factorization.

64949897273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755402666.

The product of its digits is 164602368, while the sum is 68.

The spelling of 64949897273 in words is "sixty-four billion, nine hundred forty-nine million, eight hundred ninety-seven thousand, two hundred seventy-three".