64722778865 has 8 divisors (see below), whose sum is σ = 77668943040. Its totient is φ = 51777150832.

The previous prime is 64722778853. The next prime is 64722778889. The reversal of 64722778865 is 56887722746.

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 64722778865 - 2¹⁰ = 64722777841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64722778798 and 64722778807.

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, 213452 + ... + 418338.

It is an arithmetic number, because the mean of its divisors is an integer number (9708617880).

Almost surely, 2^64722778865 is an apocalyptic number.

It is an amenable number.

64722778865 is a deficient number, since it is larger than the sum of its proper divisors (12946164175).

64722778865 is a wasteful number, since it uses less digits than its factorization.

64722778865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268071.

The product of its digits is 63221760, while the sum is 62.

The spelling of 64722778865 in words is "sixty-four billion, seven hundred twenty-two million, seven hundred seventy-eight thousand, eight hundred sixty-five".