1158632865 has 48 divisors (see below), whose sum is σ = 2166196032. Its totient is φ = 569503872.

The previous prime is 1158632857. The next prime is 1158632869. The reversal of 1158632865 is 5682368511.

1158632865 is a `hidden beast` number, since 1 + 1 + 5 + 8 + 632 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 1158632865 - 2³ = 1158632857 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1158632865.

It is not an unprimeable number, because it can be changed into a prime (1158632869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 515434 + ... + 517676.

It is an arithmetic number, because the mean of its divisors is an integer number (45129084).

Almost surely, 2^1158632865 is an apocalyptic number.

1158632865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1158632865 is a deficient number, since it is larger than the sum of its proper divisors (1007563167).

1158632865 is a wasteful number, since it uses less digits than its factorization.

1158632865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150 (or 3147 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 1158632865 is about 34038.6965819786. The cubic root of 1158632865 is about 1050.3046326979.

The spelling of 1158632865 in words is "one billion, one hundred fifty-eight million, six hundred thirty-two thousand, eight hundred sixty-five".