1011866999056 has 45 divisors (see below), whose sum is σ = 1972216529829. Its totient is φ = 502925810688.

The previous prime is 1011866998997. The next prime is 1011866999057. The reversal of 1011866999056 is 6509996681101.

The square root of 1011866999056 is 1005916.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 245163619600 + 766703379456 = 495140^2 + 875616^2 .

It is a super-2 number, since 2×1011866999056² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011866998985 and 1011866999003.

It is not an unprimeable number, because it can be changed into a prime (1011866999057) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 776566501 + ... + 776567803.

Almost surely, 2^{1011866999056} is an apocalyptic number.

1011866999056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1011866999056 is the 1005916-th square number.

It is an amenable number.

1011866999056 is a deficient number, since it is larger than the sum of its proper divisors (960349530773).

1011866999056 is an frugal number, since it uses more digits than its factorization.

1011866999056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 61.

The spelling of 1011866999056 in words is "one trillion, eleven billion, eight hundred sixty-six million, nine hundred ninety-nine thousand, fifty-six".