11543420500 has 24 divisors (see below), whose sum is σ = 25210831464. Its totient is φ = 4617368000.

The previous prime is 11543420467. The next prime is 11543420501. The reversal of 11543420500 is 502434511.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50722884 + 11492697616 = 7122^2 + 107204^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11543420501) 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, 11542921 + ... + 11543920.

It is an arithmetic number, because the mean of its divisors is an integer number (1050451311).

Almost surely, 2^11543420500 is an apocalyptic number.

11543420500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11543420500 is an abundant number, since it is smaller than the sum of its proper divisors (13667410964).

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

11543420500 is a wasteful number, since it uses less digits than its factorization.

11543420500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23086860 (or 23086848 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 11543420500 in words is "eleven billion, five hundred forty-three million, four hundred twenty thousand, five hundred".