66777583 has 2 divisors, whose sum is σ = 66777584. Its totient is φ = 66777582.

The previous prime is 66777577. The next prime is 66777587. The reversal of 66777583 is 38577766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66777583 - 2⁵ = 66777551 is a prime.

It is a super-3 number, since 3×66777583³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66777587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33388791 + 33388792.

It is an arithmetic number, because the mean of its divisors is an integer number (33388792).

Almost surely, 2^66777583 is an apocalyptic number.

66777583 is a deficient number, since it is larger than the sum of its proper divisors (1).

66777583 is an equidigital number, since it uses as much as digits as its factorization.

66777583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1481760, while the sum is 49.

The square root of 66777583 is about 8171.7551970186. The cubic root of 66777583 is about 405.7048802915.

The spelling of 66777583 in words is "sixty-six million, seven hundred seventy-seven thousand, five hundred eighty-three".