661182923 has 2 divisors, whose sum is σ = 661182924. Its totient is φ = 661182922.

The previous prime is 661182917. The next prime is 661182947. The reversal of 661182923 is 329281166.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661182923 is a prime.

It is not a weakly prime, because it can be changed into another prime (661182953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330591461 + 330591462.

It is an arithmetic number, because the mean of its divisors is an integer number (330591462).

Almost surely, 2^661182923 is an apocalyptic number.

661182923 is a deficient number, since it is larger than the sum of its proper divisors (1).

661182923 is an equidigital number, since it uses as much as digits as its factorization.

661182923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 661182923 is about 25713.4774583291. The cubic root of 661182923 is about 871.1786214318.

The spelling of 661182923 in words is "six hundred sixty-one million, one hundred eighty-two thousand, nine hundred twenty-three".