64187853821 has 8 divisors (see below), whose sum is σ = 79000435584. Its totient is φ = 50785994160.

The previous prime is 64187853811. The next prime is 64187853883. The reversal of 64187853821 is 12835878146.

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 64187853821 - 2⁶ = 64187853757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64187853811) 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, 352680425 + ... + 352680606.

It is an arithmetic number, because the mean of its divisors is an integer number (9875054448).

Almost surely, 2^64187853821 is an apocalyptic number.

It is an amenable number.

64187853821 is a deficient number, since it is larger than the sum of its proper divisors (14812581763).

64187853821 is a wasteful number, since it uses less digits than its factorization.

64187853821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705361051.

The product of its digits is 2580480, while the sum is 53.

The spelling of 64187853821 in words is "sixty-four billion, one hundred eighty-seven million, eight hundred fifty-three thousand, eight hundred twenty-one".