11278956721 has 8 divisors (see below), whose sum is σ = 11389682304. Its totient is φ = 11168745600.

The previous prime is 11278956713. The next prime is 11278956727. The reversal of 11278956721 is 12765987211.

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 11278956721 - 2³ = 11278956713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11278956727) 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, 84480 + ... + 172321.

It is an arithmetic number, because the mean of its divisors is an integer number (1423710288).

Almost surely, 2^11278956721 is an apocalyptic number.

It is an amenable number.

11278956721 is a deficient number, since it is larger than the sum of its proper divisors (110725583).

11278956721 is a wasteful number, since it uses less digits than its factorization.

11278956721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257231.

The product of its digits is 423360, while the sum is 49.

The spelling of 11278956721 in words is "eleven billion, two hundred seventy-eight million, nine hundred fifty-six thousand, seven hundred twenty-one".