11721455570 has 64 divisors (see below), whose sum is σ = 24311992320. Its totient is φ = 4028875200.

The previous prime is 11721455531. The next prime is 11721455573. The reversal of 11721455570 is 7555412711.

It is not an unprimeable number, because it can be changed into a prime (11721455573) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106661 + ... + 186599.

It is an arithmetic number, because the mean of its divisors is an integer number (379874880).

Almost surely, 2^11721455570 is an apocalyptic number.

11721455570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11721455570 is an abundant number, since it is smaller than the sum of its proper divisors (12590536750).

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

11721455570 is a wasteful number, since it uses less digits than its factorization.

11721455570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80031.

The product of its (nonzero) digits is 49000, while the sum is 38.

The spelling of 11721455570 in words is "eleven billion, seven hundred twenty-one million, four hundred fifty-five thousand, five hundred seventy".