671420565 has 12 divisors (see below), whose sum is σ = 1163795724. Its totient is φ = 358090944.

The previous prime is 671420543. The next prime is 671420597. The reversal of 671420565 is 565024176.

It is a happy number.

671420565 is a `hidden beast` number, since 6 + 71 + 4 + 20 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 127644804 + 543775761 = 11298^2 + 23319^2 .

It is not a de Polignac number, because 671420565 - 2⁶ = 671420501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7460184 + ... + 7460273.

It is an arithmetic number, because the mean of its divisors is an integer number (96982977).

Almost surely, 2^671420565 is an apocalyptic number.

It is an amenable number.

671420565 is a deficient number, since it is larger than the sum of its proper divisors (492375159).

671420565 is a wasteful number, since it uses less digits than its factorization.

671420565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14920468 (or 14920465 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 671420565 is about 25911.7842882346. The cubic root of 671420565 is about 875.6520049232.

The spelling of 671420565 in words is "six hundred seventy-one million, four hundred twenty thousand, five hundred sixty-five".