670551646 has 4 divisors (see below), whose sum is σ = 1005827472. Its totient is φ = 335275822.

The previous prime is 670551631. The next prime is 670551649. The reversal of 670551646 is 646155076.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 670551599 and 670551608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670551649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167637910 + ... + 167637913.

It is an arithmetic number, because the mean of its divisors is an integer number (251456868).

Almost surely, 2^670551646 is an apocalyptic number.

670551646 is a deficient number, since it is larger than the sum of its proper divisors (335275826).

670551646 is a wasteful number, since it uses less digits than its factorization.

670551646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335275825.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 670551646 is about 25895.0119907290. The cubic root of 670551646 is about 875.2741001408.

The spelling of 670551646 in words is "six hundred seventy million, five hundred fifty-one thousand, six hundred forty-six".