66110067061391 has 2 divisors, whose sum is σ = 66110067061392. Its totient is φ = 66110067061390.

The previous prime is 66110067061369. The next prime is 66110067061411. The reversal of 66110067061391 is 19316076001166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66110067061391 - 2²² = 66110062867087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66110067061091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33055033530695 + 33055033530696.

It is an arithmetic number, because the mean of its divisors is an integer number (33055033530696).

Almost surely, 2^{66110067061391} is an apocalyptic number.

66110067061391 is a deficient number, since it is larger than the sum of its proper divisors (1).

66110067061391 is an equidigital number, since it uses as much as digits as its factorization.

66110067061391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 47.

The spelling of 66110067061391 in words is "sixty-six trillion, one hundred ten billion, sixty-seven million, sixty-one thousand, three hundred ninety-one".