187666661023 has 4 divisors (see below), whose sum is σ = 187700931000. Its totient is φ = 187632391048.

The previous prime is 187666660999. The next prime is 187666661057. The reversal of 187666661023 is 320166666781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187666661023 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 (187666661123) 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, 17126773 + ... + 17137726.

It is an arithmetic number, because the mean of its divisors is an integer number (46925232750).

Almost surely, 2^187666661023 is an apocalyptic number.

187666661023 is a deficient number, since it is larger than the sum of its proper divisors (34269977).

187666661023 is an equidigital number, since it uses as much as digits as its factorization.

187666661023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34269976.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 187666661023 in words is "one hundred eighty-seven billion, six hundred sixty-six million, six hundred sixty-one thousand, twenty-three".