64874745808 has 20 divisors (see below), whose sum is σ = 125703702340. Its totient is φ = 32435080704.

The previous prime is 64874745797. The next prime is 64874745811. The reversal of 64874745808 is 80854747846.

It can be written as a sum of positive squares in 2 ways, for example, as 20853670464 + 44021075344 = 144408^2 + 209812^2 .

It is a super-2 number, since 2×64874745808² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103066 + ... + 374662.

It is an arithmetic number, because the mean of its divisors is an integer number (6285185117).

Almost surely, 2^64874745808 is an apocalyptic number.

It is an amenable number.

64874745808 is a deficient number, since it is larger than the sum of its proper divisors (60828956532).

64874745808 is a wasteful number, since it uses less digits than its factorization.

64874745808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286534 (or 286528 counting only the distinct ones).

The product of its (nonzero) digits is 48168960, while the sum is 61.

The spelling of 64874745808 in words is "sixty-four billion, eight hundred seventy-four million, seven hundred forty-five thousand, eight hundred eight".