64890066000 has 80 divisors (see below), whose sum is σ = 209205592128. Its totient is φ = 17304016000.

The previous prime is 64890065987. The next prime is 64890066013. The reversal of 64890066000 is 66009846.

It is an interprime number because it is at equal distance from previous prime (64890065987) and next prime (64890066013).

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 64890066000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5401506 + ... + 5413505.

Almost surely, 2^64890066000 is an apocalyptic number.

64890066000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64890066000 is an abundant number, since it is smaller than the sum of its proper divisors (144315526128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64890066000 is a wasteful number, since it uses less digits than its factorization.

64890066000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10815037 (or 10815021 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 64890066000 in words is "sixty-four billion, eight hundred ninety million, sixty-six thousand".