64457020209 has 8 divisors (see below), whose sum is σ = 85945574592. Its totient is φ = 42969906320.

The previous prime is 64457020207. The next prime is 64457020213. The reversal of 64457020209 is 90202075446.

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 64457020209 - 2¹ = 64457020207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64457020207) 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, 250989 + ... + 438074.

It is an arithmetic number, because the mean of its divisors is an integer number (10743196824).

Almost surely, 2^64457020209 is an apocalyptic number.

It is an amenable number.

64457020209 is a deficient number, since it is larger than the sum of its proper divisors (21488554383).

64457020209 is a wasteful number, since it uses less digits than its factorization.

64457020209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720247.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 64457020209 in words is "sixty-four billion, four hundred fifty-seven million, twenty thousand, two hundred nine".