187971084561 has 16 divisors (see below), whose sum is σ = 274999790016. Its totient is φ = 113491974336.

The previous prime is 187971084491. The next prime is 187971084577. The reversal of 187971084561 is 165480179781.

It is not a de Polignac number, because 187971084561 - 2¹¹ = 187971082513 is a prime.

It is a super-2 number, since 2×187971084561² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (187971084461) 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, 45467475 + ... + 45471608.

It is an arithmetic number, because the mean of its divisors is an integer number (17187486876).

Almost surely, 2^187971084561 is an apocalyptic number.

It is an amenable number.

187971084561 is a deficient number, since it is larger than the sum of its proper divisors (87028705455).

187971084561 is a wasteful number, since it uses less digits than its factorization.

187971084561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90939152.

The product of its (nonzero) digits is 3386880, while the sum is 57.

The spelling of 187971084561 in words is "one hundred eighty-seven billion, nine hundred seventy-one million, eighty-four thousand, five hundred sixty-one".