66620304287 has 12 divisors (see below), whose sum is σ = 69687754920. Its totient is φ = 63682613808.

The previous prime is 66620304281. The next prime is 66620304307. The reversal of 66620304287 is 78240302666.

It is not a de Polignac number, because 66620304287 - 2³² = 62325336991 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 (66620304281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 795413 + ... + 875169.

It is an arithmetic number, because the mean of its divisors is an integer number (5807312910).

Almost surely, 2^66620304287 is an apocalyptic number.

66620304287 is a deficient number, since it is larger than the sum of its proper divisors (3067450633).

66620304287 is a wasteful number, since it uses less digits than its factorization.

66620304287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81382 (or 81359 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 66620304287 in words is "sixty-six billion, six hundred twenty million, three hundred four thousand, two hundred eighty-seven".