11851187638 has 4 divisors (see below), whose sum is σ = 17776781460. Its totient is φ = 5925593818.

The previous prime is 11851187629. The next prime is 11851187723. The reversal of 11851187638 is 83678115811.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 11851187591 and 11851187600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2962796908 + ... + 2962796911.

It is an arithmetic number, because the mean of its divisors is an integer number (4444195365).

Almost surely, 2^11851187638 is an apocalyptic number.

11851187638 is a deficient number, since it is larger than the sum of its proper divisors (5925593822).

11851187638 is an equidigital number, since it uses as much as digits as its factorization.

11851187638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5925593821.

The product of its digits is 322560, while the sum is 49.

The spelling of 11851187638 in words is "eleven billion, eight hundred fifty-one million, one hundred eighty-seven thousand, six hundred thirty-eight".