11645447861 has 4 divisors (see below), whose sum is σ = 11648887500. Its totient is φ = 11642008224.

The previous prime is 11645447857. The next prime is 11645447873. The reversal of 11645447861 is 16874454611.

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 10441774225 + 1203673636 = 102185^2 + 34694^2 .

It is a cyclic number.

It is not a de Polignac number, because 11645447861 - 2² = 11645447857 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 (11645447851) 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, 1714736 + ... + 1721513.

It is an arithmetic number, because the mean of its divisors is an integer number (2912221875).

Almost surely, 2^11645447861 is an apocalyptic number.

It is an amenable number.

11645447861 is a deficient number, since it is larger than the sum of its proper divisors (3439639).

11645447861 is an equidigital number, since it uses as much as digits as its factorization.

11645447861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439638.

The product of its digits is 645120, while the sum is 47.

The spelling of 11645447861 in words is "eleven billion, six hundred forty-five million, four hundred forty-seven thousand, eight hundred sixty-one".