11537226381 has 12 divisors (see below), whose sum is σ = 15596602368. Its totient is φ = 7586110944.

The previous prime is 11537226359. The next prime is 11537226391. The reversal of 11537226381 is 18362273511.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-11537226381 is a prime.

It is a super-2 number, since 2×11537226381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11537226391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344845 + ... + 376818.

It is an arithmetic number, because the mean of its divisors is an integer number (1299716864).

Almost surely, 2^11537226381 is an apocalyptic number.

It is an amenable number.

11537226381 is a deficient number, since it is larger than the sum of its proper divisors (4059375987).

11537226381 is an frugal number, since it uses more digits than its factorization.

11537226381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721812 (or 721739 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

Adding to 11537226381 its reverse (18362273511), we get a palindrome (29899499892).

The spelling of 11537226381 in words is "eleven billion, five hundred thirty-seven million, two hundred twenty-six thousand, three hundred eighty-one".