11981407385 has 8 divisors (see below), whose sum is σ = 14378799240. Its totient is φ = 9584385664.

The previous prime is 11981407363. The next prime is 11981407387. The reversal of 11981407385 is 58370418911.

It can be written as a sum of positive squares in 4 ways, for example, as 6346352896 + 5635054489 = 79664^2 + 75067^2 .

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 11981407385 - 2¹⁰ = 11981406361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11981407387) 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, 15482 + ... + 155571.

It is an arithmetic number, because the mean of its divisors is an integer number (1797349905).

Almost surely, 2^11981407385 is an apocalyptic number.

It is an amenable number.

11981407385 is a deficient number, since it is larger than the sum of its proper divisors (2397391855).

11981407385 is a wasteful number, since it uses less digits than its factorization.

11981407385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185067.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 11981407385 in words is "eleven billion, nine hundred eighty-one million, four hundred seven thousand, three hundred eighty-five".