11718957520 has 80 divisors (see below), whose sum is σ = 27607608000. Its totient is φ = 4625685504.

The previous prime is 11718957479. The next prime is 11718957529. The reversal of 11718957520 is 2575981711.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11718957529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4405951 + ... + 4408609.

It is an arithmetic number, because the mean of its divisors is an integer number (345095100).

Almost surely, 2^11718957520 is an apocalyptic number.

11718957520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11718957520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13803804000).

11718957520 is an abundant number, since it is smaller than the sum of its proper divisors (15888650480).

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

11718957520 is a wasteful number, since it uses less digits than its factorization.

11718957520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380 (or 3374 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 46.

The spelling of 11718957520 in words is "eleven billion, seven hundred eighteen million, nine hundred fifty-seven thousand, five hundred twenty".