1146117721581 has 40 divisors (see below), whose sum is σ = 1956774906240. Its totient is φ = 654895240992.

The previous prime is 1146117721523. The next prime is 1146117721589. The reversal of 1146117721581 is 1851277116411.

1146117721581 is a `hidden beast` number, since 1 + 1 + 4 + 61 + 1 + 7 + 7 + 2 + 1 + 581 = 666.

It is not a de Polignac number, because 1146117721581 - 2¹¹ = 1146117719533 is a prime.

It is a super-2 number, since 2×1146117721581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1146117721589) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 24202555 + ... + 24249863.

It is an arithmetic number, because the mean of its divisors is an integer number (48919372656).

Almost surely, 2^{1146117721581} is an apocalyptic number.

It is an amenable number.

1146117721581 is a deficient number, since it is larger than the sum of its proper divisors (810657184659).

1146117721581 is an equidigital number, since it uses as much as digits as its factorization.

1146117721581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90055 (or 90046 counting only the distinct ones).

The product of its digits is 94080, while the sum is 45.

The spelling of 1146117721581 in words is "one trillion, one hundred forty-six billion, one hundred seventeen million, seven hundred twenty-one thousand, five hundred eighty-one".