661237883 has 2 divisors, whose sum is σ = 661237884. Its totient is φ = 661237882.

The previous prime is 661237859. The next prime is 661237901. The reversal of 661237883 is 388732166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661237883 is a prime.

It is not a weakly prime, because it can be changed into another prime (661237823) 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, 330618941 + 330618942.

It is an arithmetic number, because the mean of its divisors is an integer number (330618942).

Almost surely, 2^661237883 is an apocalyptic number.

661237883 is a deficient number, since it is larger than the sum of its proper divisors (1).

661237883 is an equidigital number, since it uses as much as digits as its factorization.

661237883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 44.

The square root of 661237883 is about 25714.5461363797. The cubic root of 661237883 is about 871.2027593059.

The spelling of 661237883 in words is "six hundred sixty-one million, two hundred thirty-seven thousand, eight hundred eighty-three".