64681216790 has 32 divisors (see below), whose sum is σ = 119263894560. Its totient is φ = 25248289024.

The previous prime is 64681216783. The next prime is 64681216793. The reversal of 64681216790 is 9761218646.

64681216790 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 (64681216793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319277 + ... + 480936.

It is an arithmetic number, because the mean of its divisors is an integer number (3726996705).

Almost surely, 2^64681216790 is an apocalyptic number.

64681216790 is a deficient number, since it is larger than the sum of its proper divisors (54582677770).

64681216790 is a wasteful number, since it uses less digits than its factorization.

64681216790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800416.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 64681216790 in words is "sixty-four billion, six hundred eighty-one million, two hundred sixteen thousand, seven hundred ninety".