187761677381 has 2 divisors, whose sum is σ = 187761677382. Its totient is φ = 187761677380.

The previous prime is 187761677309. The next prime is 187761677423. The reversal of 187761677381 is 183776167781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153338812225 + 34422865156 = 391585^2 + 185534^2 .

It is a cyclic number.

It is not a de Polignac number, because 187761677381 - 2²² = 187757483077 is a prime.

It is a super-2 number, since 2×187761677381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187761677281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93880838690 + 93880838691.

It is an arithmetic number, because the mean of its divisors is an integer number (93880838691).

Almost surely, 2^187761677381 is an apocalyptic number.

It is an amenable number.

187761677381 is a deficient number, since it is larger than the sum of its proper divisors (1).

187761677381 is an equidigital number, since it uses as much as digits as its factorization.

187761677381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16595712, while the sum is 62.

The spelling of 187761677381 in words is "one hundred eighty-seven billion, seven hundred sixty-one million, six hundred seventy-seven thousand, three hundred eighty-one".