661757683 has 2 divisors, whose sum is σ = 661757684. Its totient is φ = 661757682.

The previous prime is 661757647. The next prime is 661757687. The reversal of 661757683 is 386757166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661757683 - 2¹⁷ = 661626611 is a prime.

It is not a weakly prime, because it can be changed into another prime (661757687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330878841 + 330878842.

It is an arithmetic number, because the mean of its divisors is an integer number (330878842).

Almost surely, 2^661757683 is an apocalyptic number.

661757683 is a deficient number, since it is larger than the sum of its proper divisors (1).

661757683 is an equidigital number, since it uses as much as digits as its factorization.

661757683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 49.

The square root of 661757683 is about 25724.6512707170. The cubic root of 661757683 is about 871.4309840721.

The spelling of 661757683 in words is "six hundred sixty-one million, seven hundred fifty-seven thousand, six hundred eighty-three".