11945580785 has 4 divisors (see below), whose sum is σ = 14334696948. Its totient is φ = 9556464624.

The previous prime is 11945580769. The next prime is 11945580799. The reversal of 11945580785 is 58708554911.

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 2861394064 + 9084186721 = 53492^2 + 95311^2 .

It is a cyclic number.

It is not a de Polignac number, because 11945580785 - 2⁴ = 11945580769 is a prime.

It is a super-2 number, since 2×11945580785² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1194558074 + ... + 1194558083.

It is an arithmetic number, because the mean of its divisors is an integer number (3583674237).

Almost surely, 2^11945580785 is an apocalyptic number.

It is an amenable number.

11945580785 is a deficient number, since it is larger than the sum of its proper divisors (2389116163).

11945580785 is an equidigital number, since it uses as much as digits as its factorization.

11945580785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389116162.

The product of its (nonzero) digits is 2016000, while the sum is 53.

The spelling of 11945580785 in words is "eleven billion, nine hundred forty-five million, five hundred eighty thousand, seven hundred eighty-five".