669813026 has 4 divisors (see below), whose sum is σ = 1004719542. Its totient is φ = 334906512.

The previous prime is 669813013. The next prime is 669813031. The reversal of 669813026 is 620318966.

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

It can be written as a sum of positive squares in only one way, i.e., 504047401 + 165765625 = 22451^2 + 12875^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167453255 + ... + 167453258.

Almost surely, 2^669813026 is an apocalyptic number.

669813026 is a deficient number, since it is larger than the sum of its proper divisors (334906516).

669813026 is a wasteful number, since it uses less digits than its factorization.

669813026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334906515.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 669813026 is about 25880.7462411732. The cubic root of 669813026 is about 874.9526073923.

It can be divided in two parts, 66981 and 3026, that added together give a palindrome (70007).

The spelling of 669813026 in words is "six hundred sixty-nine million, eight hundred thirteen thousand, twenty-six".