671075665 has 32 divisors (see below), whose sum is σ = 890942976. Its totient is φ = 482177280.

The previous prime is 671075653. The next prime is 671075681. The reversal of 671075665 is 566570176.

It is not a de Polignac number, because 671075665 - 2¹⁹ = 670551377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450552 + ... + 452038.

It is an arithmetic number, because the mean of its divisors is an integer number (27841968).

Almost surely, 2^671075665 is an apocalyptic number.

671075665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

671075665 is a deficient number, since it is larger than the sum of its proper divisors (219867311).

671075665 is a wasteful number, since it uses less digits than its factorization.

671075665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 671075665 is about 25905.1281602697. The cubic root of 671075665 is about 875.5020422320.

The spelling of 671075665 in words is "six hundred seventy-one million, seventy-five thousand, six hundred sixty-five".