66131582291 has 8 divisors (see below), whose sum is σ = 67109203200. Its totient is φ = 65160414792.

The previous prime is 66131582269. The next prime is 66131582317. The reversal of 66131582291 is 19228513166.

It is a happy number.

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 66131582291 - 2¹⁰ = 66131581267 is a prime.

It is a super-2 number, since 2×66131582291² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66131584291) 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, 1592705 + ... + 1633698.

It is an arithmetic number, because the mean of its divisors is an integer number (8388650400).

Almost surely, 2^66131582291 is an apocalyptic number.

66131582291 is a deficient number, since it is larger than the sum of its proper divisors (977620909).

66131582291 is a wasteful number, since it uses less digits than its factorization.

66131582291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226705.

The product of its digits is 155520, while the sum is 44.

The spelling of 66131582291 in words is "sixty-six billion, one hundred thirty-one million, five hundred eighty-two thousand, two hundred ninety-one".