66385562857 has 4 divisors (see below), whose sum is σ = 67929413200. Its totient is φ = 64841712516.

The previous prime is 66385562843. The next prime is 66385562909. The reversal of 66385562857 is 75826558366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66385562857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66385562795 and 66385562804.

It is not an unprimeable number, because it can be changed into a prime (66385562557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771925107 + ... + 771925192.

It is an arithmetic number, because the mean of its divisors is an integer number (16982353300).

Almost surely, 2^66385562857 is an apocalyptic number.

It is an amenable number.

66385562857 is a deficient number, since it is larger than the sum of its proper divisors (1543850343).

66385562857 is a wasteful number, since it uses less digits than its factorization.

66385562857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543850342.

The product of its digits is 72576000, while the sum is 61.

The spelling of 66385562857 in words is "sixty-six billion, three hundred eighty-five million, five hundred sixty-two thousand, eight hundred fifty-seven".