66287275631 has 4 divisors (see below), whose sum is σ = 66533697000. Its totient is φ = 66040854264.

The previous prime is 66287275627. The next prime is 66287275633. The reversal of 66287275631 is 13657278266.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66287275631 - 2² = 66287275627 is a prime.

It is a super-2 number, since 2×66287275631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66287275633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123210281 + ... + 123210818.

It is an arithmetic number, because the mean of its divisors is an integer number (16633424250).

Almost surely, 2^66287275631 is an apocalyptic number.

66287275631 is a deficient number, since it is larger than the sum of its proper divisors (246421369).

66287275631 is a wasteful number, since it uses less digits than its factorization.

66287275631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246421368.

The product of its digits is 5080320, while the sum is 53.

The spelling of 66287275631 in words is "sixty-six billion, two hundred eighty-seven million, two hundred seventy-five thousand, six hundred thirty-one".