11994437557 has 8 divisors (see below), whose sum is σ = 12068520984. Its totient is φ = 11920409088.

The previous prime is 11994437531. The next prime is 11994437563. The reversal of 11994437557 is 75573449911.

It can be written as a sum of positive squares in 4 ways, for example, as 5364244081 + 6630193476 = 73241^2 + 81426^2 .

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 11994437557 - 2²⁷ = 11860219829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11994437498 and 11994437507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11994437527) 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, 477873 + ... + 502345.

It is an arithmetic number, because the mean of its divisors is an integer number (1508565123).

Almost surely, 2^11994437557 is an apocalyptic number.

It is an amenable number.

11994437557 is a deficient number, since it is larger than the sum of its proper divisors (74083427).

11994437557 is a wasteful number, since it uses less digits than its factorization.

11994437557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27479.

The product of its digits is 4762800, while the sum is 55.

The spelling of 11994437557 in words is "eleven billion, nine hundred ninety-four million, four hundred thirty-seven thousand, five hundred fifty-seven".