87765138181 has 12 divisors (see below), whose sum is σ = 107467517280. Its totient is φ = 71267931000.

The previous prime is 87765138163. The next prime is 87765138193. The reversal of 87765138181 is 18183156778.

It is not a de Polignac number, because 87765138181 - 2³⁵ = 53405399813 is a prime.

It is a super-2 number, since 2×87765138181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87765138151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47133945 + ... + 47135806.

It is an arithmetic number, because the mean of its divisors is an integer number (8955626440).

Almost surely, 2^87765138181 is an apocalyptic number.

It is an amenable number.

87765138181 is a deficient number, since it is larger than the sum of its proper divisors (19702379099).

87765138181 is a wasteful number, since it uses less digits than its factorization.

87765138181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94269784 (or 94269777 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 55.

The spelling of 87765138181 in words is "eighty-seven billion, seven hundred sixty-five million, one hundred thirty-eight thousand, one hundred eighty-one".