1166225643 has 24 divisors (see below), whose sum is σ = 1934412480. Its totient is φ = 669602160.

The previous prime is 1166225639. The next prime is 1166225659. The reversal of 1166225643 is 3465226611.

1166225643 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 2 + 2 + 5 + 643 = 666.

It is not a de Polignac number, because 1166225643 - 2² = 1166225639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1166225598 and 1166225607.

It is not an unprimeable number, because it can be changed into a prime (1166225243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308121 + ... + 311882.

It is an arithmetic number, because the mean of its divisors is an integer number (80600520).

Almost surely, 2^1166225643 is an apocalyptic number.

1166225643 is a deficient number, since it is larger than the sum of its proper divisors (768186837).

1166225643 is a wasteful number, since it uses less digits than its factorization.

1166225643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620039 (or 620036 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1166225643 is about 34150.0460175385. The cubic root of 1166225643 is about 1052.5939322210.

It can be divided in two parts, 116622 and 5643, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 1166225643 in words is "one billion, one hundred sixty-six million, two hundred twenty-five thousand, six hundred forty-three".