1166215045 has 16 divisors (see below), whose sum is σ = 1489477680. Its totient is φ = 873529344.

The previous prime is 1166215033. The next prime is 1166215081. The reversal of 1166215045 is 5405126611.

It can be written as a sum of positive squares in 8 ways, for example, as 205091041 + 961124004 = 14321^2 + 31002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166215045 - 2¹⁷ = 1166083973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1166214998 and 1166215016.

It is a congruent number.

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, 19140 + ... + 51949.

It is an arithmetic number, because the mean of its divisors is an integer number (93092355).

Almost surely, 2^1166215045 is an apocalyptic number.

It is an amenable number.

1166215045 is a deficient number, since it is larger than the sum of its proper divisors (323262635).

1166215045 is a wasteful number, since it uses less digits than its factorization.

1166215045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71304.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1166215045 is about 34149.8908490203. The cubic root of 1166215045 is about 1052.5907437516.

The spelling of 1166215045 in words is "one billion, one hundred sixty-six million, two hundred fifteen thousand, forty-five".