8736633721 has 2 divisors, whose sum is σ = 8736633722. Its totient is φ = 8736633720.

The previous prime is 8736633629. The next prime is 8736633749. The reversal of 8736633721 is 1273366378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8052549696 + 684084025 = 89736^2 + 26155^2 .

It is a cyclic number.

It is not a de Polignac number, because 8736633721 - 2⁷ = 8736633593 is a prime.

It is not a weakly prime, because it can be changed into another prime (8736633221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4368316860 + 4368316861.

It is an arithmetic number, because the mean of its divisors is an integer number (4368316861).

Almost surely, 2^8736633721 is an apocalyptic number.

It is an amenable number.

8736633721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8736633721 is an equidigital number, since it uses as much as digits as its factorization.

8736633721 is an evil number, because the sum of its binary digits is even.

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

The square root of 8736633721 is about 93469.9615972961. The cubic root of 8736633721 is about 2059.5928532864.

The spelling of 8736633721 in words is "eight billion, seven hundred thirty-six million, six hundred thirty-three thousand, seven hundred twenty-one".