1158252864661 has 4 divisors (see below), whose sum is σ = 1161170378572. Its totient is φ = 1155335350752.

The previous prime is 1158252864647. The next prime is 1158252864673. The reversal of 1158252864661 is 1664682528511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 254005920100 + 904246944561 = 503990^2 + 950919^2 .

It is a cyclic number.

It is not a de Polignac number, because 1158252864661 - 2⁹ = 1158252864149 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 (1158252865661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1458756360 + ... + 1458757153.

It is an arithmetic number, because the mean of its divisors is an integer number (290292594643).

Almost surely, 2^{1158252864661} is an apocalyptic number.

It is an amenable number.

1158252864661 is a deficient number, since it is larger than the sum of its proper divisors (2917513911).

1158252864661 is an equidigital number, since it uses as much as digits as its factorization.

1158252864661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2917513910.

The product of its digits is 5529600, while the sum is 55.

The spelling of 1158252864661 in words is "one trillion, one hundred fifty-eight billion, two hundred fifty-two million, eight hundred sixty-four thousand, six hundred sixty-one".