64890459693 has 8 divisors (see below), whose sum is σ = 96134014400. Its totient is φ = 43260306444.

The previous prime is 64890459649. The next prime is 64890459719. The reversal of 64890459693 is 39695409846.

64890459693 is a `hidden beast` number, since 6 + 4 + 8 + 90 + 459 + 6 + 93 = 666.

It is not a de Polignac number, because 64890459693 - 2¹⁷ = 64890328621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64890459693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64890459793) 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, 1201675153 + ... + 1201675206.

It is an arithmetic number, because the mean of its divisors is an integer number (12016751800).

Almost surely, 2^64890459693 is an apocalyptic number.

It is an amenable number.

64890459693 is a deficient number, since it is larger than the sum of its proper divisors (31243554707).

64890459693 is a wasteful number, since it uses less digits than its factorization.

64890459693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403350368 (or 2403350362 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 64890459693 in words is "sixty-four billion, eight hundred ninety million, four hundred fifty-nine thousand, six hundred ninety-three".