66836477 has 2 divisors, whose sum is σ = 66836478. Its totient is φ = 66836476.

The previous prime is 66836443. The next prime is 66836501. The reversal of 66836477 is 77463866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66814276 + 22201 = 8174^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 66836477 - 2⁸ = 66836221 is a prime.

It is a super-2 number, since 2×66836477² = 8934229315543058, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66836377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33418238 + 33418239.

It is an arithmetic number, because the mean of its divisors is an integer number (33418239).

Almost surely, 2^66836477 is an apocalyptic number.

It is an amenable number.

66836477 is a deficient number, since it is larger than the sum of its proper divisors (1).

66836477 is an equidigital number, since it uses as much as digits as its factorization.

66836477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 47.

The square root of 66836477 is about 8175.3579126543. The cubic root of 66836477 is about 405.8241147279.

The spelling of 66836477 in words is "sixty-six million, eight hundred thirty-six thousand, four hundred seventy-seven".