187868052661 has 4 divisors (see below), whose sum is σ = 187928992512. Its totient is φ = 187807112812.

The previous prime is 187868052643. The next prime is 187868052679. The reversal of 187868052661 is 166250868781.

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 an interprime number because it is at equal distance from previous prime (187868052643) and next prime (187868052679).

It is a cyclic number.

It is not a de Polignac number, because 187868052661 - 2²⁹ = 187331181749 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 187868052596 and 187868052605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187868052611) 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, 30465301 + ... + 30471466.

It is an arithmetic number, because the mean of its divisors is an integer number (46982248128).

Almost surely, 2^187868052661 is an apocalyptic number.

It is an amenable number.

187868052661 is a deficient number, since it is larger than the sum of its proper divisors (60939851).

187868052661 is an equidigital number, since it uses as much as digits as its factorization.

187868052661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60939850.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 187868052661 in words is "one hundred eighty-seven billion, eight hundred sixty-eight million, fifty-two thousand, six hundred sixty-one".