66305677 has 2 divisors, whose sum is σ = 66305678. Its totient is φ = 66305676.

The previous prime is 66305639. The next prime is 66305689. The reversal of 66305677 is 77650366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33884041 + 32421636 = 5821^2 + 5694^2 .

It is a cyclic number.

It is not a de Polignac number, because 66305677 - 2¹⁵ = 66272909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66305377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33152838 + 33152839.

It is an arithmetic number, because the mean of its divisors is an integer number (33152839).

Almost surely, 2^66305677 is an apocalyptic number.

It is an amenable number.

66305677 is a deficient number, since it is larger than the sum of its proper divisors (1).

66305677 is an equidigital number, since it uses as much as digits as its factorization.

66305677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 40.

The square root of 66305677 is about 8142.8297906809. The cubic root of 66305677 is about 404.7469373709.

The spelling of 66305677 in words is "sixty-six million, three hundred five thousand, six hundred seventy-seven".