866159772 has 12 divisors (see below), whose sum is σ = 2021039496. Its totient is φ = 288719920.

The previous prime is 866159771. The next prime is 866159773. The reversal of 866159772 is 277951668.

It is an interprime number because it is at equal distance from previous prime (866159771) and next prime (866159773).

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866159771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36089979 + ... + 36090002.

It is an arithmetic number, because the mean of its divisors is an integer number (168419958).

Almost surely, 2^866159772 is an apocalyptic number.

It is an amenable number.

866159772 is an abundant number, since it is smaller than the sum of its proper divisors (1154879724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866159772 is a wasteful number, since it uses less digits than its factorization.

866159772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72179988 (or 72179986 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The square root of 866159772 is about 29430.5924507136. The cubic root of 866159772 is about 953.2335875667.

The spelling of 866159772 in words is "eight hundred sixty-six million, one hundred fifty-nine thousand, seven hundred seventy-two".