1158821667 has 16 divisors (see below), whose sum is σ = 1731970080. Its totient is φ = 765709056.

The previous prime is 1158821659. The next prime is 1158821669. The reversal of 1158821667 is 7661288511.

1158821667 is a `hidden beast` number, since 1 + 1 + 588 + 2 + 1 + 6 + 67 = 666.

It is not a de Polignac number, because 1158821667 - 2³ = 1158821659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1158821669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186858 + ... + 192959.

It is an arithmetic number, because the mean of its divisors is an integer number (108248130).

Almost surely, 2^1158821667 is an apocalyptic number.

1158821667 is a deficient number, since it is larger than the sum of its proper divisors (573148413).

1158821667 is a wasteful number, since it uses less digits than its factorization.

1158821667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379939 (or 379933 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 1158821667 is about 34041.4698125683. The cubic root of 1158821667 is about 1050.3616794844.

The spelling of 1158821667 in words is "one billion, one hundred fifty-eight million, eight hundred twenty-one thousand, six hundred sixty-seven".