27835611981 has 16 divisors (see below), whose sum is σ = 38400220800. Its totient is φ = 17914248128.

The previous prime is 27835611967. The next prime is 27835611989. The reversal of 27835611981 is 18911653872.

It is a cyclic number.

It is not a de Polignac number, because 27835611981 - 2²¹ = 27833514829 is a prime.

It is a super-2 number, since 2×27835611981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27835611989) 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, 593275 + ... + 638471.

It is an arithmetic number, because the mean of its divisors is an integer number (2400013800).

Almost surely, 2^27835611981 is an apocalyptic number.

It is an amenable number.

27835611981 is a deficient number, since it is larger than the sum of its proper divisors (10564608819).

27835611981 is a wasteful number, since it uses less digits than its factorization.

27835611981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52308.

The product of its digits is 725760, while the sum is 51.

The spelling of 27835611981 in words is "twenty-seven billion, eight hundred thirty-five million, six hundred eleven thousand, nine hundred eighty-one".