27811301661 has 48 divisors (see below), whose sum is σ = 49678923840. Its totient is φ = 14739874560.

The previous prime is 27811301641. The next prime is 27811301669. The reversal of 27811301661 is 16610311872.

It is not a de Polignac number, because 27811301661 - 2¹⁵ = 27811268893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27811301669) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 544216 + ... + 593121.

It is an arithmetic number, because the mean of its divisors is an integer number (1034977580).

Almost surely, 2^27811301661 is an apocalyptic number.

It is an amenable number.

27811301661 is a deficient number, since it is larger than the sum of its proper divisors (21867622179).

27811301661 is a wasteful number, since it uses less digits than its factorization.

27811301661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137386 (or 1137383 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 27811301661 in words is "twenty-seven billion, eight hundred eleven million, three hundred one thousand, six hundred sixty-one".