81676667 has 2 divisors, whose sum is σ = 81676668. Its totient is φ = 81676666.

The previous prime is 81676627. The next prime is 81676669. The reversal of 81676667 is 76667618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81676667 - 2⁶ = 81676603 is a prime.

Together with 81676669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81676669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838333 + 40838334.

It is an arithmetic number, because the mean of its divisors is an integer number (40838334).

Almost surely, 2^81676667 is an apocalyptic number.

81676667 is a deficient number, since it is larger than the sum of its proper divisors (1).

81676667 is an equidigital number, since it uses as much as digits as its factorization.

81676667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The square root of 81676667 is about 9037.5144259913. The cubic root of 81676667 is about 433.8763743532.

The spelling of 81676667 in words is "eighty-one million, six hundred seventy-six thousand, six hundred sixty-seven".