64795864821 has 4 divisors (see below), whose sum is σ = 86394486432. Its totient is φ = 43197243212.

The previous prime is 64795864801. The next prime is 64795864883. The reversal of 64795864821 is 12846859746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64795864821 - 2⁵ = 64795864789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64795864801) 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, 10799310801 + ... + 10799310806.

It is an arithmetic number, because the mean of its divisors is an integer number (21598621608).

Almost surely, 2^64795864821 is an apocalyptic number.

It is an amenable number.

64795864821 is a deficient number, since it is larger than the sum of its proper divisors (21598621611).

64795864821 is a wasteful number, since it uses less digits than its factorization.

64795864821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21598621610.

The product of its digits is 23224320, while the sum is 60.

The spelling of 64795864821 in words is "sixty-four billion, seven hundred ninety-five million, eight hundred sixty-four thousand, eight hundred twenty-one".