670918917 has 4 divisors (see below), whose sum is σ = 894558560. Its totient is φ = 447279276.

The previous prime is 670918909. The next prime is 670918951. The reversal of 670918917 is 719819076.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 670918917 - 2³ = 670918909 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 (670918907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111819817 + ... + 111819822.

It is an arithmetic number, because the mean of its divisors is an integer number (223639640).

Almost surely, 2^670918917 is an apocalyptic number.

It is an amenable number.

670918917 is a deficient number, since it is larger than the sum of its proper divisors (223639643).

670918917 is a wasteful number, since it uses less digits than its factorization.

670918917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223639642.

The product of its (nonzero) digits is 190512, while the sum is 48.

The square root of 670918917 is about 25902.1025594449. The cubic root of 670918917 is about 875.4338711412.

The spelling of 670918917 in words is "six hundred seventy million, nine hundred eighteen thousand, nine hundred seventeen".