63996761 has 2 divisors, whose sum is σ = 63996762. Its totient is φ = 63996760.

The previous prime is 63996749. The next prime is 63996781. The reversal of 63996761 is 16769936.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58446025 + 5550736 = 7645^2 + 2356^2 .

It is a cyclic number.

It is not a de Polignac number, because 63996761 - 2¹⁸ = 63734617 is a prime.

It is a super-2 number, since 2×63996761² = 8191170836982242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63996701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31998380 + 31998381.

It is an arithmetic number, because the mean of its divisors is an integer number (31998381).

Almost surely, 2^63996761 is an apocalyptic number.

It is an amenable number.

63996761 is a deficient number, since it is larger than the sum of its proper divisors (1).

63996761 is an equidigital number, since it uses as much as digits as its factorization.

63996761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 47.

The square root of 63996761 is about 7999.7975599386. The cubic root of 63996761 is about 399.9932519695.

The spelling of 63996761 in words is "sixty-three million, nine hundred ninety-six thousand, seven hundred sixty-one".