66800131 has 2 divisors, whose sum is σ = 66800132. Its totient is φ = 66800130.

The previous prime is 66800099. The next prime is 66800141. The reversal of 66800131 is 13100866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66800131 - 2⁵ = 66800099 is a prime.

It is a super-2 number, since 2×66800131² = 8924515003234322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66800096 and 66800105.

It is not a weakly prime, because it can be changed into another prime (66800141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33400065 + 33400066.

It is an arithmetic number, because the mean of its divisors is an integer number (33400066).

Almost surely, 2^66800131 is an apocalyptic number.

66800131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66800131 is an equidigital number, since it uses as much as digits as its factorization.

66800131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 66800131 is about 8173.1347107459. The cubic root of 66800131 is about 405.7505383493.

Adding to 66800131 its reverse (13100866), we get a palindrome (79900997).

The spelling of 66800131 in words is "sixty-six million, eight hundred thousand, one hundred thirty-one".