187690384861 has 24 divisors (see below), whose sum is σ = 216167180544. Its totient is φ = 159636715680.

The previous prime is 187690384859. The next prime is 187690384883. The reversal of 187690384861 is 168483096781.

It is not a de Polignac number, because 187690384861 - 2¹ = 187690384859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 187690384861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187690384801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423680106 + ... + 423680548.

It is an arithmetic number, because the mean of its divisors is an integer number (9006965856).

Almost surely, 2^187690384861 is an apocalyptic number.

It is an amenable number.

187690384861 is a deficient number, since it is larger than the sum of its proper divisors (28476795683).

187690384861 is an frugal number, since it uses more digits than its factorization.

187690384861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 61.

The spelling of 187690384861 in words is "one hundred eighty-seven billion, six hundred ninety million, three hundred eighty-four thousand, eight hundred sixty-one".