1158786661 has 8 divisors (see below), whose sum is σ = 1186217120. Its totient is φ = 1131378192.

The previous prime is 1158786659. The next prime is 1158786749. The reversal of 1158786661 is 1666878511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1158786661 - 2¹ = 1158786659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158781661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156910 + ... + 164128.

It is an arithmetic number, because the mean of its divisors is an integer number (148277140).

Almost surely, 2^1158786661 is an apocalyptic number.

It is an amenable number.

1158786661 is a deficient number, since it is larger than the sum of its proper divisors (27430459).

1158786661 is an equidigital number, since it uses as much as digits as its factorization.

1158786661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10995.

The product of its digits is 483840, while the sum is 49.

The square root of 1158786661 is about 34040.9556416973. The cubic root of 1158786661 is about 1050.3511028409.

The spelling of 1158786661 in words is "one billion, one hundred fifty-eight million, seven hundred eighty-six thousand, six hundred sixty-one".