64896017647 has 4 divisors (see below), whose sum is σ = 64931462416. Its totient is φ = 64860572880.

The previous prime is 64896017629. The next prime is 64896017653. The reversal of 64896017647 is 74671069846.

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

It is a cyclic number.

It is not a de Polignac number, because 64896017647 - 2⁷ = 64896017519 is a prime.

It is a super-2 number, since 2×64896017647² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64896017591 and 64896017600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64896017657) 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, 17719638 + ... + 17723299.

It is an arithmetic number, because the mean of its divisors is an integer number (16232865604).

Almost surely, 2^64896017647 is an apocalyptic number.

64896017647 is a deficient number, since it is larger than the sum of its proper divisors (35444769).

64896017647 is a wasteful number, since it uses less digits than its factorization.

64896017647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35444768.

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 64896017647 in words is "sixty-four billion, eight hundred ninety-six million, seventeen thousand, six hundred forty-seven".