1243640002815 has 32 divisors (see below), whose sum is σ = 2526760642560. Its totient is φ = 568521143712.

The previous prime is 1243640002807. The next prime is 1243640002819. The reversal of 1243640002815 is 5182000463421.

It is a happy number.

1243640002815 is a `hidden beast` number, since 1 + 2 + 4 + 3 + 640 + 0 + 0 + 2 + 8 + 1 + 5 = 666.

It is not a de Polignac number, because 1243640002815 - 2³ = 1243640002807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243640002815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243640002819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 658009639 + ... + 658011528.

It is an arithmetic number, because the mean of its divisors is an integer number (78961270080).

Almost surely, 2^{1243640002815} is an apocalyptic number.

1243640002815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1243640002815 is an abundant number, since it is smaller than the sum of its proper divisors (1283120639745).

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

1243640002815 is a wasteful number, since it uses less digits than its factorization.

1243640002815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316021188 (or 1316021182 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 1243640002815 in words is "one trillion, two hundred forty-three billion, six hundred forty million, two thousand, eight hundred fifteen".