671647477 has 2 divisors, whose sum is σ = 671647478. Its totient is φ = 671647476.

The previous prime is 671647469. The next prime is 671647499. The reversal of 671647477 is 774746176.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600936196 + 70711281 = 24514^2 + 8409^2 .

It is a cyclic number.

It is not a de Polignac number, because 671647477 - 2³ = 671647469 is a prime.

It is a super-2 number, since 2×671647477² = 902220666720931058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 671647477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671647877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335823738 + 335823739.

It is an arithmetic number, because the mean of its divisors is an integer number (335823739).

Almost surely, 2^671647477 is an apocalyptic number.

It is an amenable number.

671647477 is a deficient number, since it is larger than the sum of its proper divisors (1).

671647477 is an equidigital number, since it uses as much as digits as its factorization.

671647477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382976, while the sum is 49.

The square root of 671647477 is about 25916.1624666925. The cubic root of 671647477 is about 875.7506383673.

The spelling of 671647477 in words is "six hundred seventy-one million, six hundred forty-seven thousand, four hundred seventy-seven".