1956919866 has 32 divisors (see below), whose sum is σ = 4311111168. Its totient is φ = 587246640.

The previous prime is 1956919859. The next prime is 1956919889. The reversal of 1956919866 is 6689196591.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137136 + ... + 150731.

It is an arithmetic number, because the mean of its divisors is an integer number (134722224).

Almost surely, 2^1956919866 is an apocalyptic number.

1956919866 is an abundant number, since it is smaller than the sum of its proper divisors (2354191302).

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

1956919866 is a wasteful number, since it uses less digits than its factorization.

1956919866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287986.

The product of its digits is 6298560, while the sum is 60.

The square root of 1956919866 is about 44237.0869972244. The cubic root of 1956919866 is about 1250.8090476539.

The spelling of 1956919866 in words is "one billion, nine hundred fifty-six million, nine hundred nineteen thousand, eight hundred sixty-six".