64781538863 has 8 divisors (see below), whose sum is σ = 68208132720. Its totient is φ = 61356648960.

The previous prime is 64781538847. The next prime is 64781538907. The reversal of 64781538863 is 36883518746.

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 64781538863 - 2⁴ = 64781538847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64781538803) 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, 347570 + ... + 500367.

It is an arithmetic number, because the mean of its divisors is an integer number (8526016590).

Almost surely, 2^64781538863 is an apocalyptic number.

64781538863 is a deficient number, since it is larger than the sum of its proper divisors (3426593857).

64781538863 is a wasteful number, since it uses less digits than its factorization.

64781538863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851977.

The product of its digits is 23224320, while the sum is 59.

The spelling of 64781538863 in words is "sixty-four billion, seven hundred eighty-one million, five hundred thirty-eight thousand, eight hundred sixty-three".