11638704881 has 8 divisors (see below), whose sum is σ = 12256157760. Its totient is φ = 11030537232.

The previous prime is 11638704877. The next prime is 11638704899. The reversal of 11638704881 is 18840783611.

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 11638704881 - 2² = 11638704877 is a prime.

It is a super-2 number, since 2×11638704881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11638704841) 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, 2318735 + ... + 2323748.

It is an arithmetic number, because the mean of its divisors is an integer number (1532019720).

Almost surely, 2^11638704881 is an apocalyptic number.

It is an amenable number.

11638704881 is a deficient number, since it is larger than the sum of its proper divisors (617452879).

11638704881 is a wasteful number, since it uses less digits than its factorization.

11638704881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4642615.

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 11638704881 in words is "eleven billion, six hundred thirty-eight million, seven hundred four thousand, eight hundred eighty-one".