763663721 has 2 divisors, whose sum is σ = 763663722. Its totient is φ = 763663720.

The previous prime is 763663709. The next prime is 763663739. The reversal of 763663721 is 127366367.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389628121 + 374035600 = 19739^2 + 19340^2 .

It is a cyclic number.

It is not a de Polignac number, because 763663721 - 2⁶ = 763663657 is a prime.

It is not a weakly prime, because it can be changed into another prime (763663741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 381831860 + 381831861.

It is an arithmetic number, because the mean of its divisors is an integer number (381831861).

Almost surely, 2^763663721 is an apocalyptic number.

It is an amenable number.

763663721 is a deficient number, since it is larger than the sum of its proper divisors (1).

763663721 is an equidigital number, since it uses as much as digits as its factorization.

763663721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 41.

The square root of 763663721 is about 27634.4661790309. The cubic root of 763663721 is about 914.0445982289.

The spelling of 763663721 in words is "seven hundred sixty-three million, six hundred sixty-three thousand, seven hundred twenty-one".