1261872800966 has 12 divisors (see below), whose sum is σ = 1900695945636. Its totient is φ = 628318349280.

The previous prime is 1261872800939. The next prime is 1261872801023. The reversal of 1261872800966 is 6690082781621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5315360 + ... + 5547683.

It is an arithmetic number, because the mean of its divisors is an integer number (158391328803).

Almost surely, 2^{1261872800966} is an apocalyptic number.

1261872800966 is a deficient number, since it is larger than the sum of its proper divisors (638823144670).

1261872800966 is an equidigital number, since it uses as much as digits as its factorization.

1261872800966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10863527 (or 10863286 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 1261872800966 in words is "one trillion, two hundred sixty-one billion, eight hundred seventy-two million, eight hundred thousand, nine hundred sixty-six".