66192881 has 2 divisors, whose sum is σ = 66192882. Its totient is φ = 66192880.

The previous prime is 66192853. The next prime is 66192899. The reversal of 66192881 is 18829166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44102881 + 22090000 = 6641^2 + 4700^2 .

It is a cyclic number.

It is not a de Polignac number, because 66192881 - 2⁶ = 66192817 is a prime.

It is a super-2 number, since 2×66192881² = 8762994990160322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66192811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33096440 + 33096441.

It is an arithmetic number, because the mean of its divisors is an integer number (33096441).

Almost surely, 2^66192881 is an apocalyptic number.

It is an amenable number.

66192881 is a deficient number, since it is larger than the sum of its proper divisors (1).

66192881 is an equidigital number, since it uses as much as digits as its factorization.

66192881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 66192881 is about 8135.9007491488. The cubic root of 66192881 is about 404.5172951535.

The spelling of 66192881 in words is "sixty-six million, one hundred ninety-two thousand, eight hundred eighty-one".