64767706723 has 4 divisors (see below), whose sum is σ = 65408971248. Its totient is φ = 64126442200.

The previous prime is 64767706699. The next prime is 64767706739. The reversal of 64767706723 is 32760776746.

64767706723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64767706723 - 2¹⁷ = 64767575651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64767706763) 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, 320632111 + ... + 320632312.

It is an arithmetic number, because the mean of its divisors is an integer number (16352242812).

Almost surely, 2^64767706723 is an apocalyptic number.

64767706723 is a deficient number, since it is larger than the sum of its proper divisors (641264525).

64767706723 is a wasteful number, since it uses less digits than its factorization.

64767706723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641264524.

The product of its (nonzero) digits is 12446784, while the sum is 55.

The spelling of 64767706723 in words is "sixty-four billion, seven hundred sixty-seven million, seven hundred six thousand, seven hundred twenty-three".