670668653 has 4 divisors (see below), whose sum is σ = 670826940. Its totient is φ = 670510368.

The previous prime is 670668629. The next prime is 670668659. The reversal of 670668653 is 356866076.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 436517449 + 234151204 = 20893^2 + 15302^2 .

It is a cyclic number.

It is not a de Polignac number, because 670668653 - 2¹² = 670664557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 670668598 and 670668607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670668659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72608 + ... + 81321.

It is an arithmetic number, because the mean of its divisors is an integer number (167706735).

Almost surely, 2^670668653 is an apocalyptic number.

It is an amenable number.

670668653 is a deficient number, since it is larger than the sum of its proper divisors (158287).

670668653 is a wasteful number, since it uses less digits than its factorization.

670668653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158286.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The square root of 670668653 is about 25897.2711496791. The cubic root of 670668653 is about 875.3250071022.

The spelling of 670668653 in words is "six hundred seventy million, six hundred sixty-eight thousand, six hundred fifty-three".