666906846 has 16 divisors (see below), whose sum is σ = 1334444544. Its totient is φ = 222197144.

The previous prime is 666906809. The next prime is 666906847. The reversal of 666906846 is 648609666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666906847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11940 + ... + 38423.

It is an arithmetic number, because the mean of its divisors is an integer number (83402784).

Almost surely, 2^666906846 is an apocalyptic number.

666906846 is an abundant number, since it is smaller than the sum of its proper divisors (667537698).

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

666906846 is a wasteful number, since it uses less digits than its factorization.

666906846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52575.

The product of its (nonzero) digits is 2239488, while the sum is 51.

The square root of 666906846 is about 25824.5396086745. The cubic root of 666906846 is about 873.6853601273.

It can be divided in two parts, 66690 and 6846, that added together give a triangular number (73536 = T₃₈₃).

The spelling of 666906846 in words is "six hundred sixty-six million, nine hundred six thousand, eight hundred forty-six".