87591778111 has 4 divisors (see below), whose sum is σ = 88031938000. Its totient is φ = 87151618224.

The previous prime is 87591778097. The next prime is 87591778121. The reversal of 87591778111 is 11187719578.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87591778111 - 2⁷ = 87591777983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87591778121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220079646 + ... + 220080043.

It is an arithmetic number, because the mean of its divisors is an integer number (22007984500).

Almost surely, 2^87591778111 is an apocalyptic number.

87591778111 is a deficient number, since it is larger than the sum of its proper divisors (440159889).

87591778111 is a wasteful number, since it uses less digits than its factorization.

87591778111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440159888.

The product of its digits is 987840, while the sum is 55.

The spelling of 87591778111 in words is "eighty-seven billion, five hundred ninety-one million, seven hundred seventy-eight thousand, one hundred eleven".