12543257440220 has 96 divisors (see below), whose sum is σ = 29611688787072. Its totient is φ = 4428305215488.

The previous prime is 12543257440169. The next prime is 12543257440277. The reversal of 12543257440220 is 2204475234521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15347024 + ... + 16143656.

It is an arithmetic number, because the mean of its divisors is an integer number (308455091532).

Almost surely, 2^{12543257440220} is an apocalyptic number.

12543257440220 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 12543257440220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14805844393536).

12543257440220 is an abundant number, since it is smaller than the sum of its proper divisors (17068431346852).

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

12543257440220 is a wasteful number, since it uses less digits than its factorization.

12543257440220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799311 (or 799309 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 41.

The spelling of 12543257440220 in words is "twelve trillion, five hundred forty-three billion, two hundred fifty-seven million, four hundred forty thousand, two hundred twenty".