861166071 has 12 divisors (see below), whose sum is σ = 1245140520. Its totient is φ = 573541200.

The previous prime is 861166063. The next prime is 861166079. The reversal of 861166071 is 170661168.

It is an interprime number because it is at equal distance from previous prime (861166063) and next prime (861166079).

It is not a de Polignac number, because 861166071 - 2³ = 861166063 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861166079) 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, 37780 + ... + 56121.

It is an arithmetic number, because the mean of its divisors is an integer number (103761710).

Almost surely, 2^861166071 is an apocalyptic number.

861166071 is a deficient number, since it is larger than the sum of its proper divisors (383974449).

861166071 is a wasteful number, since it uses less digits than its factorization.

861166071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94926 (or 94923 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 861166071 is about 29345.6312080691. The cubic root of 861166071 is about 951.3981521709.

The spelling of 861166071 in words is "eight hundred sixty-one million, one hundred sixty-six thousand, seventy-one".