661674763 has 2 divisors, whose sum is σ = 661674764. Its totient is φ = 661674762.

The previous prime is 661674749. The next prime is 661674779. The reversal of 661674763 is 367476166.

661674763 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661674763 is a prime.

It is a super-2 number, since 2×661674763² = 875626983982212338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (661674703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330837381 + 330837382.

It is an arithmetic number, because the mean of its divisors is an integer number (330837382).

Almost surely, 2^661674763 is an apocalyptic number.

661674763 is a deficient number, since it is larger than the sum of its proper divisors (1).

661674763 is an equidigital number, since it uses as much as digits as its factorization.

661674763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 46.

The square root of 661674763 is about 25723.0395365711. The cubic root of 661674763 is about 871.3945850108.

The spelling of 661674763 in words is "six hundred sixty-one million, six hundred seventy-four thousand, seven hundred sixty-three".