33961491397681 has 4 divisors (see below), whose sum is σ = 33978480640000. Its totient is φ = 33944502155364.

The previous prime is 33961491397663. The next prime is 33961491397723. The reversal of 33961491397681 is 18679319416933.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33961491397681 - 2¹⁹ = 33961490873393 is a prime.

It is a super-2 number, since 2×33961491397681² (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 33961491397681.

It is not an unprimeable number, because it can be changed into a prime (33961491397651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8494618161 + ... + 8494622158.

It is an arithmetic number, because the mean of its divisors is an integer number (8494620160000).

Almost surely, 2^{33961491397681} is an apocalyptic number.

It is an amenable number.

33961491397681 is a deficient number, since it is larger than the sum of its proper divisors (16989242319).

33961491397681 is a wasteful number, since it uses less digits than its factorization.

33961491397681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16989242318.

The product of its digits is 158723712, while the sum is 70.

The spelling of 33961491397681 in words is "thirty-three trillion, nine hundred sixty-one billion, four hundred ninety-one million, three hundred ninety-seven thousand, six hundred eighty-one".