64789906641 has 4 divisors (see below), whose sum is σ = 86386542192. Its totient is φ = 43193271092.

The previous prime is 64789906639. The next prime is 64789906651. The reversal of 64789906641 is 14660998746.

64789906641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64789906641 - 2¹ = 64789906639 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64789906651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10798317771 + ... + 10798317776.

It is an arithmetic number, because the mean of its divisors is an integer number (21596635548).

Almost surely, 2^64789906641 is an apocalyptic number.

It is an amenable number.

64789906641 is a deficient number, since it is larger than the sum of its proper divisors (21596635551).

64789906641 is a wasteful number, since it uses less digits than its factorization.

64789906641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21596635550.

The product of its (nonzero) digits is 15676416, while the sum is 60.

The spelling of 64789906641 in words is "sixty-four billion, seven hundred eighty-nine million, nine hundred six thousand, six hundred forty-one".