102543243400520 has 32 divisors (see below), whose sum is σ = 248470166702520. Its totient is φ = 37862120640000.

The previous prime is 102543243400453. The next prime is 102543243400531. The reversal of 102543243400520 is 25004342345201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 92582768536036 + 9960474864484 = 9621994^2 + 3156022^2 .

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, 98599271981 + ... + 98599273020.

Almost surely, 2^{102543243400520} is an apocalyptic number.

102543243400520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102543243400520 is an abundant number, since it is smaller than the sum of its proper divisors (145926923302000).

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

102543243400520 is a wasteful number, since it uses less digits than its factorization.

102543243400520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197198545025 (or 197198545021 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 102543243400520 its reverse (25004342345201), we get a palindrome (127547585745721).

The spelling of 102543243400520 in words is "one hundred two trillion, five hundred forty-three billion, two hundred forty-three million, four hundred thousand, five hundred twenty".