663131261 has 8 divisors (see below), whose sum is σ = 737178624. Its totient is φ = 592374960.

The previous prime is 663131237. The next prime is 663131269. The reversal of 663131261 is 162131366.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663131261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663131269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822341 + ... + 823146.

It is an arithmetic number, because the mean of its divisors is an integer number (92147328).

Almost surely, 2^663131261 is an apocalyptic number.

It is an amenable number.

663131261 is a deficient number, since it is larger than the sum of its proper divisors (74047363).

663131261 is a wasteful number, since it uses less digits than its factorization.

663131261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645531.

The product of its digits is 3888, while the sum is 29.

The square root of 663131261 is about 25751.3351304355. The cubic root of 663131261 is about 872.0334962619.

The spelling of 663131261 in words is "six hundred sixty-three million, one hundred thirty-one thousand, two hundred sixty-one".