11721226578 has 16 divisors (see below), whose sum is σ = 24676266720. Its totient is φ = 3701439936.

The previous prime is 11721226547. The next prime is 11721226591. The reversal of 11721226578 is 87562212711.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51408775 + ... + 51409002.

It is an arithmetic number, because the mean of its divisors is an integer number (1542266670).

Almost surely, 2^11721226578 is an apocalyptic number.

11721226578 is an abundant number, since it is smaller than the sum of its proper divisors (12955040142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11721226578 is a wasteful number, since it uses less digits than its factorization.

11721226578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102817801.

The product of its digits is 94080, while the sum is 42.

The spelling of 11721226578 in words is "eleven billion, seven hundred twenty-one million, two hundred twenty-six thousand, five hundred seventy-eight".