667376819 has 2 divisors, whose sum is σ = 667376820. Its totient is φ = 667376818.

The previous prime is 667376779. The next prime is 667376821. The reversal of 667376819 is 918673766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667376819 is a prime.

It is a super-2 number, since 2×667376819² = 890783637077117522, which contains 22 as substring.

Together with 667376821, 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 (667376839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333688409 + 333688410.

It is an arithmetic number, because the mean of its divisors is an integer number (333688410).

Almost surely, 2^667376819 is an apocalyptic number.

667376819 is a deficient number, since it is larger than the sum of its proper divisors (1).

667376819 is an equidigital number, since it uses as much as digits as its factorization.

667376819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 53.

The square root of 667376819 is about 25833.6373552003. The cubic root of 667376819 is about 873.8905422639.

The spelling of 667376819 in words is "six hundred sixty-seven million, three hundred seventy-six thousand, eight hundred nineteen".