66660131 has 2 divisors, whose sum is σ = 66660132. Its totient is φ = 66660130.

The previous prime is 66660127. The next prime is 66660161. The reversal of 66660131 is 13106666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66660131 - 2² = 66660127 is a prime.

It is a super-2 number, since 2×66660131² = 8887146129874322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66660094 and 66660103.

It is not a weakly prime, because it can be changed into another prime (66660161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33330065 + 33330066.

It is an arithmetic number, because the mean of its divisors is an integer number (33330066).

Almost surely, 2^66660131 is an apocalyptic number.

66660131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66660131 is an equidigital number, since it uses as much as digits as its factorization.

66660131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66660131 is about 8164.5655732562. The cubic root of 66660131 is about 405.4668821903.

Adding to 66660131 its reverse (13106666), we get a palindrome (79766797).

The spelling of 66660131 in words is "sixty-six million, six hundred sixty thousand, one hundred thirty-one".