187877498881 has 2 divisors, whose sum is σ = 187877498882. Its totient is φ = 187877498880.

The previous prime is 187877498869. The next prime is 187877498891. The reversal of 187877498881 is 188894778781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141538478656 + 46339020225 = 376216^2 + 215265^2 .

It is an emirp because it is prime and its reverse (188894778781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187877498881 is a prime.

It is a super-2 number, since 2×187877498881² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 187877498798 and 187877498807.

It is not a weakly prime, because it can be changed into another prime (187877498801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93938749440 + 93938749441.

It is an arithmetic number, because the mean of its divisors is an integer number (93938749441).

Almost surely, 2^187877498881 is an apocalyptic number.

It is an amenable number.

187877498881 is a deficient number, since it is larger than the sum of its proper divisors (1).

187877498881 is an equidigital number, since it uses as much as digits as its factorization.

187877498881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 404619264, while the sum is 76.

The spelling of 187877498881 in words is "one hundred eighty-seven billion, eight hundred seventy-seven million, four hundred ninety-eight thousand, eight hundred eighty-one".