11811920738 has 8 divisors (see below), whose sum is σ = 17718547500. Its totient is φ = 5905738240.

The previous prime is 11811920699. The next prime is 11811920759. The reversal of 11811920738 is 83702911811.

It can be written as a sum of positive squares in 2 ways, for example, as 10645493329 + 1166427409 = 103177^2 + 34153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11811920695 and 11811920704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33863 + ... + 157386.

Almost surely, 2^11811920738 is an apocalyptic number.

11811920738 is a deficient number, since it is larger than the sum of its proper divisors (5906626762).

11811920738 is a wasteful number, since it uses less digits than its factorization.

11811920738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222132.

The product of its (nonzero) digits is 24192, while the sum is 41.

The spelling of 11811920738 in words is "eleven billion, eight hundred eleven million, nine hundred twenty thousand, seven hundred thirty-eight".