64861779712 has 36 divisors (see below), whose sum is σ = 129700446120. Its totient is φ = 32373214208.

The previous prime is 64861779709. The next prime is 64861779713. The reversal of 64861779712 is 21797716846.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64861779713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80887 + ... + 369142.

It is an arithmetic number, because the mean of its divisors is an integer number (3602790170).

Almost surely, 2^64861779712 is an apocalyptic number.

It is an amenable number.

64861779712 is a deficient number, since it is larger than the sum of its proper divisors (64838666408).

64861779712 is an equidigital number, since it uses as much as digits as its factorization.

64861779712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450608 (or 450594 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 58.

The spelling of 64861779712 in words is "sixty-four billion, eight hundred sixty-one million, seven hundred seventy-nine thousand, seven hundred twelve".