861155516 has 12 divisors (see below), whose sum is σ = 1622947032. Its totient is φ = 397456368.

The previous prime is 861155497. The next prime is 861155527. The reversal of 861155516 is 615551168.

It is a self number, because there is not a number n which added to its sum of digits gives 861155516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8280290 + ... + 8280393.

It is an arithmetic number, because the mean of its divisors is an integer number (135245586).

Almost surely, 2^861155516 is an apocalyptic number.

It is an amenable number.

861155516 is a deficient number, since it is larger than the sum of its proper divisors (761791516).

861155516 is a wasteful number, since it uses less digits than its factorization.

861155516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16560700 (or 16560698 counting only the distinct ones).

The product of its digits is 36000, while the sum is 38.

The square root of 861155516 is about 29345.4513681422. The cubic root of 861155516 is about 951.3942651744.

The spelling of 861155516 in words is "eight hundred sixty-one million, one hundred fifty-five thousand, five hundred sixteen".