1243452513525 has 48 divisors (see below), whose sum is σ = 2095245419520. Its totient is φ = 650584224000.

The previous prime is 1243452513481. The next prime is 1243452513547. The reversal of 1243452513525 is 5253152543421.

It is not a de Polignac number, because 1243452513525 - 2⁶ = 1243452513461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72684 + ... + 1578666.

It is an arithmetic number, because the mean of its divisors is an integer number (43650946240).

Almost surely, 2^{1243452513525} is an apocalyptic number.

1243452513525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1243452513525 is a deficient number, since it is larger than the sum of its proper divisors (851792905995).

1243452513525 is a wasteful number, since it uses less digits than its factorization.

1243452513525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506206 (or 1506201 counting only the distinct ones).

The product of its digits is 720000, while the sum is 42.

The spelling of 1243452513525 in words is "one trillion, two hundred forty-three billion, four hundred fifty-two million, five hundred thirteen thousand, five hundred twenty-five".