186873885721 has 4 divisors (see below), whose sum is σ = 197866467252. Its totient is φ = 175881304192.

The previous prime is 186873885659. The next prime is 186873885727. The reversal of 186873885721 is 127588378681.

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

It can be written as a sum of positive squares in 2 ways, for example, as 125148967696 + 61724918025 = 353764^2 + 248445^2 .

It is a cyclic number.

It is not a de Polignac number, because 186873885721 - 2¹¹ = 186873883673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (186873885727) 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, 5496290740 + ... + 5496290773.

It is an arithmetic number, because the mean of its divisors is an integer number (49466616813).

Almost surely, 2^186873885721 is an apocalyptic number.

It is an amenable number.

186873885721 is a deficient number, since it is larger than the sum of its proper divisors (10992581531).

186873885721 is a wasteful number, since it uses less digits than its factorization.

186873885721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10992581530.

The product of its digits is 36126720, while the sum is 64.

The spelling of 186873885721 in words is "one hundred eighty-six billion, eight hundred seventy-three million, eight hundred eighty-five thousand, seven hundred twenty-one".