64990865091 has 8 divisors (see below), whose sum is σ = 88768011024. Its totient is φ = 42270481280.

The previous prime is 64990865063. The next prime is 64990865117. The reversal of 64990865091 is 19056809946.

64990865091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64990865091 - 2⁹ = 64990864579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64991865091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264190386 + ... + 264190631.

It is an arithmetic number, because the mean of its divisors is an integer number (11096001378).

Almost surely, 2^64990865091 is an apocalyptic number.

64990865091 is a deficient number, since it is larger than the sum of its proper divisors (23777145933).

64990865091 is a wasteful number, since it uses less digits than its factorization.

64990865091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528381061.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The spelling of 64990865091 in words is "sixty-four billion, nine hundred ninety million, eight hundred sixty-five thousand, ninety-one".