667888901 has 2 divisors, whose sum is σ = 667888902. Its totient is φ = 667888900.

The previous prime is 667888883. The next prime is 667888913. The reversal of 667888901 is 109888766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 567868900 + 100020001 = 23830^2 + 10001^2 .

It is a cyclic number.

It is not a de Polignac number, because 667888901 - 2²² = 663694597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667888981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333944450 + 333944451.

It is an arithmetic number, because the mean of its divisors is an integer number (333944451).

Almost surely, 2^667888901 is an apocalyptic number.

It is an amenable number.

667888901 is a deficient number, since it is larger than the sum of its proper divisors (1).

667888901 is an equidigital number, since it uses as much as digits as its factorization.

667888901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 667888901 is about 25843.5466025853. The cubic root of 667888901 is about 874.1139988356.

The spelling of 667888901 in words is "six hundred sixty-seven million, eight hundred eighty-eight thousand, nine hundred one".