33990881911561 has 4 divisors (see below), whose sum is σ = 35779875696400. Its totient is φ = 32201888126724.

The previous prime is 33990881911541. The next prime is 33990881911661. The reversal of 33990881911561 is 16511918809933.

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 not a de Polignac number, because 33990881911561 - 2¹⁹ = 33990881387273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33990881911493 and 33990881911502.

It is not an unprimeable number, because it can be changed into a prime (33990881911541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894496892391 + ... + 894496892428.

It is an arithmetic number, because the mean of its divisors is an integer number (8944968924100).

Almost surely, 2^{33990881911561} is an apocalyptic number.

It is an amenable number.

33990881911561 is a deficient number, since it is larger than the sum of its proper divisors (1788993784839).

33990881911561 is a wasteful number, since it uses less digits than its factorization.

33990881911561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788993784838.

The product of its (nonzero) digits is 12597120, while the sum is 64.

The spelling of 33990881911561 in words is "thirty-three trillion, nine hundred ninety billion, eight hundred eighty-one million, nine hundred eleven thousand, five hundred sixty-one".