64667259823 has 4 divisors (see below), whose sum is σ = 66415023640. Its totient is φ = 62919496008.

The previous prime is 64667259821. The next prime is 64667259841. The reversal of 64667259823 is 32895276646.

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 64667259823 - 2¹ = 64667259821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64667259821) 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, 873881853 + ... + 873881926.

It is an arithmetic number, because the mean of its divisors is an integer number (16603755910).

Almost surely, 2^64667259823 is an apocalyptic number.

64667259823 is a deficient number, since it is larger than the sum of its proper divisors (1747763817).

64667259823 is a wasteful number, since it uses less digits than its factorization.

64667259823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747763816.

The product of its digits is 26127360, while the sum is 58.

The spelling of 64667259823 in words is "sixty-four billion, six hundred sixty-seven million, two hundred fifty-nine thousand, eight hundred twenty-three".