1158009506661 has 16 divisors (see below), whose sum is σ = 1785845988864. Its totient is φ = 653747190384.

The previous prime is 1158009506629. The next prime is 1158009506681. The reversal of 1158009506661 is 1666059008511.

It is not a de Polignac number, because 1158009506661 - 2⁵ = 1158009506629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1158009506661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158009506681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332186871 + ... + 332190356.

It is an arithmetic number, because the mean of its divisors is an integer number (111615374304).

Almost surely, 2^{1158009506661} is an apocalyptic number.

It is an amenable number.

1158009506661 is a deficient number, since it is larger than the sum of its proper divisors (627836482203).

1158009506661 is an equidigital number, since it uses as much as digits as its factorization.

1158009506661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664377320.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 1158009506661 in words is "one trillion, one hundred fifty-eight billion, nine million, five hundred six thousand, six hundred sixty-one".