87877778361 has 4 divisors (see below), whose sum is σ = 117170371152. Its totient is φ = 58585185572.

The previous prime is 87877778347. The next prime is 87877778393. The reversal of 87877778361 is 16387777878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87877778361 - 2¹⁴ = 87877761977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87877779361) 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 in 3 ways as a sum of consecutive naturals, for example, 14646296391 + ... + 14646296396.

It is an arithmetic number, because the mean of its divisors is an integer number (29292592788).

Almost surely, 2^87877778361 is an apocalyptic number.

It is an amenable number.

87877778361 is a deficient number, since it is larger than the sum of its proper divisors (29292592791).

87877778361 is a wasteful number, since it uses less digits than its factorization.

87877778361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29292592790.

The product of its digits is 154893312, while the sum is 69.

The spelling of 87877778361 in words is "eighty-seven billion, eight hundred seventy-seven million, seven hundred seventy-eight thousand, three hundred sixty-one".