27811982990621 has 8 divisors (see below), whose sum is σ = 27899047661184. Its totient is φ = 27725053831200.

The previous prime is 27811982990593. The next prime is 27811982990629. The reversal of 27811982990621 is 12609928911872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27811982990621 - 2²² = 27811978796317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27811982990629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33466661 + ... + 34287626.

It is an arithmetic number, because the mean of its divisors is an integer number (3487380957648).

Almost surely, 2^{27811982990621} is an apocalyptic number.

It is an amenable number.

27811982990621 is a deficient number, since it is larger than the sum of its proper divisors (87064670563).

27811982990621 is an equidigital number, since it uses as much as digits as its factorization.

27811982990621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67755571.

The product of its (nonzero) digits is 15676416, while the sum is 65.

The spelling of 27811982990621 in words is "twenty-seven trillion, eight hundred eleven billion, nine hundred eighty-two million, nine hundred ninety thousand, six hundred twenty-one".