187057804861 has 2 divisors, whose sum is σ = 187057804862. Its totient is φ = 187057804860.

The previous prime is 187057804853. The next prime is 187057804867. The reversal of 187057804861 is 168408750781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113505652836 + 73552152025 = 336906^2 + 271205^2 .

It is a cyclic number.

It is not a de Polignac number, because 187057804861 - 2³ = 187057804853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187057804867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93528902430 + 93528902431.

It is an arithmetic number, because the mean of its divisors is an integer number (93528902431).

Almost surely, 2^187057804861 is an apocalyptic number.

It is an amenable number.

187057804861 is a deficient number, since it is larger than the sum of its proper divisors (1).

187057804861 is an equidigital number, since it uses as much as digits as its factorization.

187057804861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3010560, while the sum is 55.

The spelling of 187057804861 in words is "one hundred eighty-seven billion, fifty-seven million, eight hundred four thousand, eight hundred sixty-one".