11719721478 has 16 divisors (see below), whose sum is σ = 23445661680. Its totient is φ = 3905537376.

The previous prime is 11719721471. The next prime is 11719721479. The reversal of 11719721478 is 87412791711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11719721471) 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, 234433 + ... + 279996.

It is an arithmetic number, because the mean of its divisors is an integer number (1465353855).

Almost surely, 2^11719721478 is an apocalyptic number.

11719721478 is an abundant number, since it is smaller than the sum of its proper divisors (11725940202).

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

11719721478 is a wasteful number, since it uses less digits than its factorization.

11719721478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518231.

The product of its digits is 197568, while the sum is 48.

The spelling of 11719721478 in words is "eleven billion, seven hundred nineteen million, seven hundred twenty-one thousand, four hundred seventy-eight".