66976139 has 2 divisors, whose sum is σ = 66976140. Its totient is φ = 66976138.

The previous prime is 66976127. The next prime is 66976163. The reversal of 66976139 is 93167966.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66976139 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66976093 and 66976102.

It is not a weakly prime, because it can be changed into another prime (66976439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33488069 + 33488070.

It is an arithmetic number, because the mean of its divisors is an integer number (33488070).

Almost surely, 2^66976139 is an apocalyptic number.

66976139 is a deficient number, since it is larger than the sum of its proper divisors (1).

66976139 is an equidigital number, since it uses as much as digits as its factorization.

66976139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 47.

The square root of 66976139 is about 8183.8950995232. The cubic root of 66976139 is about 406.1065890962.

The spelling of 66976139 in words is "sixty-six million, nine hundred seventy-six thousand, one hundred thirty-nine".