66031189497261 has 12 divisors (see below), whose sum is σ = 96527521997088. Its totient is φ = 43490421997704.

The previous prime is 66031189497257. The next prime is 66031189497269. The reversal of 66031189497261 is 16279498113066.

66031189497261 is a `hidden beast` number, since 6 + 6 + 0 + 3 + 1 + 1 + 89 + 497 + 2 + 61 = 666.

It is not a de Polignac number, because 66031189497261 - 2² = 66031189497257 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66031189497269) 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, 44197582585 + ... + 44197584078.

It is an arithmetic number, because the mean of its divisors is an integer number (8043960166424).

Almost surely, 2^{66031189497261} is an apocalyptic number.

It is an amenable number.

66031189497261 is a deficient number, since it is larger than the sum of its proper divisors (30496332499827).

66031189497261 is a wasteful number, since it uses less digits than its factorization.

66031189497261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88395166752 (or 88395166749 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 66031189497261 in words is "sixty-six trillion, thirty-one billion, one hundred eighty-nine million, four hundred ninety-seven thousand, two hundred sixty-one".