661433351 has 2 divisors, whose sum is σ = 661433352. Its totient is φ = 661433350.

The previous prime is 661433327. The next prime is 661433359. The reversal of 661433351 is 153334166.

661433351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661433351 - 2¹⁰ = 661432327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661433359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330716675 + 330716676.

It is an arithmetic number, because the mean of its divisors is an integer number (330716676).

Almost surely, 2^661433351 is an apocalyptic number.

661433351 is a deficient number, since it is larger than the sum of its proper divisors (1).

661433351 is an equidigital number, since it uses as much as digits as its factorization.

661433351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 32.

The square root of 661433351 is about 25718.3465837133. The cubic root of 661433351 is about 871.2885960313.

The spelling of 661433351 in words is "six hundred sixty-one million, four hundred thirty-three thousand, three hundred fifty-one".