64840212565 has 8 divisors (see below), whose sum is σ = 78535435680. Its totient is φ = 51387382992.

The previous prime is 64840212553. The next prime is 64840212599. The reversal of 64840212565 is 56521204846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64840212565 - 2²³ = 64831823957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60597795 + ... + 60598864.

It is an arithmetic number, because the mean of its divisors is an integer number (9816929460).

Almost surely, 2^64840212565 is an apocalyptic number.

It is an amenable number.

64840212565 is a deficient number, since it is larger than the sum of its proper divisors (13695223115).

64840212565 is a wasteful number, since it uses less digits than its factorization.

64840212565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121196771.

The product of its (nonzero) digits is 460800, while the sum is 43.

The spelling of 64840212565 in words is "sixty-four billion, eight hundred forty million, two hundred twelve thousand, five hundred sixty-five".