1966966856 has 16 divisors (see below), whose sum is σ = 3717104640. Its totient is φ = 975738960.

The previous prime is 1966966853. The next prime is 1966966867. The reversal of 1966966856 is 6586696691.

It is a super-2 number, since 2×1966966856² = 7737917225205049472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1966966853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966980 + ... + 969011.

It is an arithmetic number, because the mean of its divisors is an integer number (232319040).

Almost surely, 2^1966966856 is an apocalyptic number.

It is an amenable number.

1966966856 is a deficient number, since it is larger than the sum of its proper divisors (1750137784).

1966966856 is a wasteful number, since it uses less digits than its factorization.

1966966856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936124 (or 1936120 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 62.

The square root of 1966966856 is about 44350.5000648245. The cubic root of 1966966856 is about 1252.9459807834.

It can be divided in two parts, 196696685 and 6, that added together give a palindrome (196696691).

The spelling of 1966966856 in words is "one billion, nine hundred sixty-six million, nine hundred sixty-six thousand, eight hundred fifty-six".