11985767945 has 8 divisors (see below), whose sum is σ = 14654297736. Its totient is φ = 9407696896.

The previous prime is 11985767903. The next prime is 11985768029. The reversal of 11985767945 is 54976758911.

It can be written as a sum of positive squares in 4 ways, for example, as 122855056 + 11862912889 = 11084^2 + 108917^2 .

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 11985767945 - 2⁶ = 11985767881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22614392 + ... + 22614921.

It is an arithmetic number, because the mean of its divisors is an integer number (1831787217).

Almost surely, 2^11985767945 is an apocalyptic number.

It is an amenable number.

11985767945 is a deficient number, since it is larger than the sum of its proper divisors (2668529791).

11985767945 is an equidigital number, since it uses as much as digits as its factorization.

11985767945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45229371.

The product of its digits is 19051200, while the sum is 62.

The spelling of 11985767945 in words is "eleven billion, nine hundred eighty-five million, seven hundred sixty-seven thousand, nine hundred forty-five".