187242279857 has 4 divisors (see below), whose sum is σ = 187247576100. Its totient is φ = 187236983616.

The previous prime is 187242279853. The next prime is 187242279863. The reversal of 187242279857 is 758972242781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758972242781 = 863 ⋅879457987.

It can be written as a sum of positive squares in 2 ways, for example, as 74987797921 + 112254481936 = 273839^2 + 335044^2 .

It is a cyclic number.

It is not a de Polignac number, because 187242279857 - 2² = 187242279853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 187242279857.

It is not an unprimeable number, because it can be changed into a prime (187242279853) 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, 2594732 + ... + 2665917.

It is an arithmetic number, because the mean of its divisors is an integer number (46811894025).

Almost surely, 2^187242279857 is an apocalyptic number.

It is an amenable number.

187242279857 is a deficient number, since it is larger than the sum of its proper divisors (5296243).

187242279857 is an equidigital number, since it uses as much as digits as its factorization.

187242279857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5296242.

The product of its digits is 31610880, while the sum is 62.

The spelling of 187242279857 in words is "one hundred eighty-seven billion, two hundred forty-two million, two hundred seventy-nine thousand, eight hundred fifty-seven".