12618516500 has 24 divisors (see below), whose sum is σ = 27558841128. Its totient is φ = 5047406400.

The previous prime is 12618516487. The next prime is 12618516529. The reversal of 12618516500 is 561581621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 57486724 + 12561029776 = 7582^2 + 112076^2 .

It is a congruent number.

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, 12618017 + ... + 12619016.

It is an arithmetic number, because the mean of its divisors is an integer number (1148285047).

Almost surely, 2^12618516500 is an apocalyptic number.

12618516500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12618516500 is an abundant number, since it is smaller than the sum of its proper divisors (14940324628).

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

12618516500 is a wasteful number, since it uses less digits than its factorization.

12618516500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25237052 (or 25237040 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 12618516500 in words is "twelve billion, six hundred eighteen million, five hundred sixteen thousand, five hundred".