66892591 has 2 divisors, whose sum is σ = 66892592. Its totient is φ = 66892590.

The previous prime is 66892583. The next prime is 66892619. The reversal of 66892591 is 19529866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66892591 - 2³ = 66892583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66892541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33446295 + 33446296.

It is an arithmetic number, because the mean of its divisors is an integer number (33446296).

Almost surely, 2^66892591 is an apocalyptic number.

66892591 is a deficient number, since it is larger than the sum of its proper divisors (1).

66892591 is an equidigital number, since it uses as much as digits as its factorization.

66892591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 46.

The square root of 66892591 is about 8178.7890913020. The cubic root of 66892591 is about 405.9376557429.

The spelling of 66892591 in words is "sixty-six million, eight hundred ninety-two thousand, five hundred ninety-one".