64723519806 has 64 divisors (see below), whose sum is σ = 141807352320. Its totient is φ = 19531100160.

The previous prime is 64723519801. The next prime is 64723519813. The reversal of 64723519806 is 60891532746.

64723519806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64723519801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17401615 + ... + 17405333.

It is an arithmetic number, because the mean of its divisors is an integer number (2215739880).

It is a 1-persistent number, because it is pandigital, but 2⋅64723519806 = 129447039612 is not.

Almost surely, 2^64723519806 is an apocalyptic number.

64723519806 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64723519806 is an abundant number, since it is smaller than the sum of its proper divisors (77083832514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64723519806 is a wasteful number, since it uses less digits than its factorization.

64723519806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 64723519806 in words is "sixty-four billion, seven hundred twenty-three million, five hundred nineteen thousand, eight hundred six".