66980131 has 2 divisors, whose sum is σ = 66980132. Its totient is φ = 66980130.

The previous prime is 66980129. The next prime is 66980171. The reversal of 66980131 is 13108966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66980131 - 2¹ = 66980129 is a prime.

It is a super-2 number, since 2×66980131² = 8972675897554322, which contains 22 as substring.

Together with 66980129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66980171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33490065 + 33490066.

It is an arithmetic number, because the mean of its divisors is an integer number (33490066).

Almost surely, 2^66980131 is an apocalyptic number.

66980131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66980131 is an equidigital number, since it uses as much as digits as its factorization.

66980131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 66980131 is about 8184.1389895334. The cubic root of 66980131 is about 406.1146573691.

It can be divided in two parts, 66 and 980131, that multiplied together give a palindrome (64688646).

The spelling of 66980131 in words is "sixty-six million, nine hundred eighty thousand, one hundred thirty-one".