663129293 has 4 divisors (see below), whose sum is σ = 663269820. Its totient is φ = 662988768.

The previous prime is 663129253. The next prime is 663129329. The reversal of 663129293 is 392921366.

663129293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 561784804 + 101344489 = 23702^2 + 10067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663129293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663129293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663129223) 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, 62930 + ... + 72707.

It is an arithmetic number, because the mean of its divisors is an integer number (165817455).

Almost surely, 2^663129293 is an apocalyptic number.

It is an amenable number.

663129293 is a deficient number, since it is larger than the sum of its proper divisors (140527).

663129293 is a wasteful number, since it uses less digits than its factorization.

663129293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140526.

The product of its digits is 104976, while the sum is 41.

The square root of 663129293 is about 25751.2969187961. The cubic root of 663129293 is about 872.0326336053.

The spelling of 663129293 in words is "six hundred sixty-three million, one hundred twenty-nine thousand, two hundred ninety-three".