64953961771 has 6 divisors (see below), whose sum is σ = 65424282980. Its totient is φ = 64483683936.

The previous prime is 64953961753. The next prime is 64953961783. The reversal of 64953961771 is 17716935946.

It is not a de Polignac number, because 64953961771 - 2¹¹ = 64953959723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64953961711) 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, 2993955 + ... + 3015571.

Almost surely, 2^64953961771 is an apocalyptic number.

64953961771 is a deficient number, since it is larger than the sum of its proper divisors (470321209).

64953961771 is an frugal number, since it uses more digits than its factorization.

64953961771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43373 (or 21756 counting only the distinct ones).

The product of its digits is 8573040, while the sum is 58.

The spelling of 64953961771 in words is "sixty-four billion, nine hundred fifty-three million, nine hundred sixty-one thousand, seven hundred seventy-one".