33064699721 has 16 divisors (see below), whose sum is σ = 34623592080. Its totient is φ = 31546920960.

The previous prime is 33064699687. The next prime is 33064699739. The reversal of 33064699721 is 12799646033.

It can be written as a sum of positive squares in 8 ways, for example, as 129709321 + 32934990400 = 11389^2 + 181480^2 .

It is a cyclic number.

It is not a de Polignac number, because 33064699721 - 2³⁰ = 31990957897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 33064699721.

It is not an unprimeable number, because it can be changed into a prime (33064699741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348941 + ... + 433461.

It is an arithmetic number, because the mean of its divisors is an integer number (2163974505).

Almost surely, 2^33064699721 is an apocalyptic number.

It is an amenable number.

33064699721 is a deficient number, since it is larger than the sum of its proper divisors (1558892359).

33064699721 is a wasteful number, since it uses less digits than its factorization.

33064699721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84764.

The product of its (nonzero) digits is 1469664, while the sum is 50.

The spelling of 33064699721 in words is "thirty-three billion, sixty-four million, six hundred ninety-nine thousand, seven hundred twenty-one".