670517861 has 8 divisors (see below), whose sum is σ = 723055704. Its totient is φ = 618117120.

The previous prime is 670517849. The next prime is 670517899. The reversal of 670517861 is 168715076.

It can be written as a sum of positive squares in 4 ways, for example, as 3587236 + 666930625 = 1894^2 + 25825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 670517861 - 2⁶ = 670517797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670517801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23996 + ... + 43781.

It is an arithmetic number, because the mean of its divisors is an integer number (90381963).

Almost surely, 2^670517861 is an apocalyptic number.

It is an amenable number.

670517861 is a deficient number, since it is larger than the sum of its proper divisors (52537843).

670517861 is a wasteful number, since it uses less digits than its factorization.

670517861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68551.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 670517861 is about 25894.3596368012. The cubic root of 670517861 is about 875.2593999894.

The spelling of 670517861 in words is "six hundred seventy million, five hundred seventeen thousand, eight hundred sixty-one".