11661280838 has 4 divisors (see below), whose sum is σ = 17491921260. Its totient is φ = 5830640418.

The previous prime is 11661280817. The next prime is 11661280871. The reversal of 11661280838 is 83808216611.

It is a happy number.

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

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, 2915320208 + ... + 2915320211.

It is an arithmetic number, because the mean of its divisors is an integer number (4372980315).

Almost surely, 2^11661280838 is an apocalyptic number.

11661280838 is a deficient number, since it is larger than the sum of its proper divisors (5830640422).

11661280838 is an equidigital number, since it uses as much as digits as its factorization.

11661280838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5830640421.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 11661280838 in words is "eleven billion, six hundred sixty-one million, two hundred eighty thousand, eight hundred thirty-eight".