64677719827 has 4 divisors (see below), whose sum is σ = 73917394096. Its totient is φ = 55438045560.

The previous prime is 64677719809. The next prime is 64677719833. The reversal of 64677719827 is 72891777646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64677719827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64677719837) 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, 4619837124 + ... + 4619837137.

It is an arithmetic number, because the mean of its divisors is an integer number (18479348524).

Almost surely, 2^64677719827 is an apocalyptic number.

64677719827 is a deficient number, since it is larger than the sum of its proper divisors (9239674269).

64677719827 is an equidigital number, since it uses as much as digits as its factorization.

64677719827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9239674268.

The product of its digits is 49787136, while the sum is 64.

The spelling of 64677719827 in words is "sixty-four billion, six hundred seventy-seven million, seven hundred nineteen thousand, eight hundred twenty-seven".