72205887057691 has 2 divisors, whose sum is σ = 72205887057692. Its totient is φ = 72205887057690.

The previous prime is 72205887057673. The next prime is 72205887057701. The reversal of 72205887057691 is 19675078850227.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72205887057691 - 2⁴⁵ = 37021514968859 is a prime.

It is not a weakly prime, because it can be changed into another prime (72205887057671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36102943528845 + 36102943528846.

It is an arithmetic number, because the mean of its divisors is an integer number (36102943528846).

Almost surely, 2^{72205887057691} is an apocalyptic number.

72205887057691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72205887057691 is an equidigital number, since it uses as much as digits as its factorization.

72205887057691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118540800, while the sum is 67.

The spelling of 72205887057691 in words is "seventy-two trillion, two hundred five billion, eight hundred eighty-seven million, fifty-seven thousand, six hundred ninety-one".