66902486291 has 4 divisors (see below), whose sum is σ = 70423669800. Its totient is φ = 63381302784.

The previous prime is 66902486279. The next prime is 66902486309. The reversal of 66902486291 is 19268420966.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66902486291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66902486221) 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, 1760591726 + ... + 1760591763.

It is an arithmetic number, because the mean of its divisors is an integer number (17605917450).

Almost surely, 2^66902486291 is an apocalyptic number.

66902486291 is a deficient number, since it is larger than the sum of its proper divisors (3521183509).

66902486291 is a wasteful number, since it uses less digits than its factorization.

66902486291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521183508.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 66902486291 in words is "sixty-six billion, nine hundred two million, four hundred eighty-six thousand, two hundred ninety-one".