187681855513 has 2 divisors, whose sum is σ = 187681855514. Its totient is φ = 187681855512.

The previous prime is 187681855481. The next prime is 187681855573. The reversal of 187681855513 is 315558186781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185542978009 + 2138877504 = 430747^2 + 46248^2 .

It is a cyclic number.

It is not a de Polignac number, because 187681855513 - 2⁵ = 187681855481 is a prime.

It is not a weakly prime, because it can be changed into another prime (187681855573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93840927756 + 93840927757.

It is an arithmetic number, because the mean of its divisors is an integer number (93840927757).

Almost surely, 2^187681855513 is an apocalyptic number.

It is an amenable number.

187681855513 is a deficient number, since it is larger than the sum of its proper divisors (1).

187681855513 is an equidigital number, since it uses as much as digits as its factorization.

187681855513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064000, while the sum is 58.

The spelling of 187681855513 in words is "one hundred eighty-seven billion, six hundred eighty-one million, eight hundred fifty-five thousand, five hundred thirteen".