671647877 has 2 divisors, whose sum is σ = 671647878. Its totient is φ = 671647876.

The previous prime is 671647793. The next prime is 671647901. The reversal of 671647877 is 778746176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 566154436 + 105493441 = 23794^2 + 10271^2 .

It is a cyclic number.

It is not a de Polignac number, because 671647877 - 2⁸ = 671647621 is a prime.

It is a super-2 number, since 2×671647877² = 902221741357214258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671647477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335823938 + 335823939.

It is an arithmetic number, because the mean of its divisors is an integer number (335823939).

Almost surely, 2^671647877 is an apocalyptic number.

It is an amenable number.

671647877 is a deficient number, since it is larger than the sum of its proper divisors (1).

671647877 is an equidigital number, since it uses as much as digits as its factorization.

671647877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 53.

The square root of 671647877 is about 25916.1701838833. The cubic root of 671647877 is about 875.7508122185.

The spelling of 671647877 in words is "six hundred seventy-one million, six hundred forty-seven thousand, eight hundred seventy-seven".