667376771 has 2 divisors, whose sum is σ = 667376772. Its totient is φ = 667376770.

The previous prime is 667376719. The next prime is 667376777. The reversal of 667376771 is 177673766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667376771 - 2¹⁰ = 667375747 is a prime.

It is not a weakly prime, because it can be changed into another prime (667376777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333688385 + 333688386.

It is an arithmetic number, because the mean of its divisors is an integer number (333688386).

Almost surely, 2^667376771 is an apocalyptic number.

667376771 is a deficient number, since it is larger than the sum of its proper divisors (1).

667376771 is an equidigital number, since it uses as much as digits as its factorization.

667376771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555848, while the sum is 50.

The square root of 667376771 is about 25833.6364261790. The cubic root of 667376771 is about 873.8905213128.

The spelling of 667376771 in words is "six hundred sixty-seven million, three hundred seventy-six thousand, seven hundred seventy-one".