66948877 has 2 divisors, whose sum is σ = 66948878. Its totient is φ = 66948876.

The previous prime is 66948863. The next prime is 66948887. The reversal of 66948877 is 77884966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45549001 + 21399876 = 6749^2 + 4626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66948877 is a prime.

It is a super-2 number, since 2×66948877² = 8964304263122258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66948857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33474438 + 33474439.

It is an arithmetic number, because the mean of its divisors is an integer number (33474439).

Almost surely, 2^66948877 is an apocalyptic number.

It is an amenable number.

66948877 is a deficient number, since it is larger than the sum of its proper divisors (1).

66948877 is an equidigital number, since it uses as much as digits as its factorization.

66948877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 55.

The square root of 66948877 is about 8182.2293416892. The cubic root of 66948877 is about 406.0514810110.

The spelling of 66948877 in words is "sixty-six million, nine hundred forty-eight thousand, eight hundred seventy-seven".