33989611263721 has 3 divisors (see below), whose sum is σ = 33989617093783. Its totient is φ = 33989605433660.

The previous prime is 33989611263703. The next prime is 33989611263737. The reversal of 33989611263721 is 12736211698933.

The square root of 33989611263721 is 5830061.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 14485552268121 + 19504058995600 = 3805989^2 + 4416340^2 .

It is not a de Polignac number, because 33989611263721 - 2⁵ = 33989611263689 is a prime.

It is a super-2 number, since 2×33989611263721² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33989611263721.

It is not an unprimeable number, because it can be changed into a prime (33989611263781) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2915031 + ... + 8745091.

Almost surely, 2^{33989611263721} is an apocalyptic number.

33989611263721 is the 5830061-st square number.

33989611263721 is the 2915031-st centered octagonal number.

It is an amenable number.

33989611263721 is a deficient number, since it is larger than the sum of its proper divisors (5830062).

33989611263721 is an frugal number, since it uses more digits than its factorization.

33989611263721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11660122 (or 5830061 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 61.

The spelling of 33989611263721 in words is "thirty-three trillion, nine hundred eighty-nine billion, six hundred eleven million, two hundred sixty-three thousand, seven hundred twenty-one".