668202629 has 4 divisors (see below), whose sum is σ = 707508684. Its totient is φ = 628896576.

The previous prime is 668202617. The next prime is 668202637. The reversal of 668202629 is 926202866.

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 599760100 + 68442529 = 24490^2 + 8273^2 .

It is a cyclic number.

It is not a de Polignac number, because 668202629 - 2¹² = 668198533 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 (668202679) 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, 19653002 + ... + 19653035.

It is an arithmetic number, because the mean of its divisors is an integer number (176877171).

Almost surely, 2^668202629 is an apocalyptic number.

It is an amenable number.

668202629 is a deficient number, since it is larger than the sum of its proper divisors (39306055).

668202629 is a wasteful number, since it uses less digits than its factorization.

668202629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39306054.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 668202629 is about 25849.6156451116. The cubic root of 668202629 is about 874.2508435058.

The spelling of 668202629 in words is "six hundred sixty-eight million, two hundred two thousand, six hundred twenty-nine".