77866133 has 2 divisors, whose sum is σ = 77866134. Its totient is φ = 77866132.

The previous prime is 77866121. The next prime is 77866177. The reversal of 77866133 is 33166877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72216004 + 5650129 = 8498^2 + 2377^2 .

It is a cyclic number.

It is not a de Polignac number, because 77866133 - 2²⁴ = 61088917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77866193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38933066 + 38933067.

It is an arithmetic number, because the mean of its divisors is an integer number (38933067).

Almost surely, 2^77866133 is an apocalyptic number.

It is an amenable number.

77866133 is a deficient number, since it is larger than the sum of its proper divisors (1).

77866133 is an equidigital number, since it uses as much as digits as its factorization.

77866133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 77866133 is about 8824.1788853128. The cubic root of 77866133 is about 427.0212974329.

The spelling of 77866133 in words is "seventy-seven million, eight hundred sixty-six thousand, one hundred thirty-three".