2001956866 has 16 divisors (see below), whose sum is σ = 3695920704. Its totient is φ = 791982864.

The previous prime is 2001956861. The next prime is 2001956867. The reversal of 2001956866 is 6686591002.

It is not an unprimeable number, because it can be changed into a prime (2001956861) 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, 5499700 + ... + 5500063.

It is an arithmetic number, because the mean of its divisors is an integer number (230995044).

Almost surely, 2^2001956866 is an apocalyptic number.

2001956866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2001956866 is a deficient number, since it is larger than the sum of its proper divisors (1693963838).

2001956866 is a wasteful number, since it uses less digits than its factorization.

2001956866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10999785.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 2001956866 is about 44743.2326279629. The cubic root of 2001956866 is about 1260.3318320606.

The spelling of 2001956866 in words is "two billion, one million, nine hundred fifty-six thousand, eight hundred sixty-six".