1540543123252 has 24 divisors (see below), whose sum is σ = 3081124692800. Its totient is φ = 660224528640.

The previous prime is 1540543123237. The next prime is 1540543123253. The reversal of 1540543123252 is 2523213450451.

It is a happy number.

It is a super-2 number, since 2×1540543123252² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540543123253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2296999 + ... + 2890897.

Almost surely, 2^{1540543123252} is an apocalyptic number.

It is an amenable number.

1540543123252 is an abundant number, since it is smaller than the sum of its proper divisors (1540581569548).

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

1540543123252 is a wasteful number, since it uses less digits than its factorization.

1540543123252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686551 (or 686549 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 1540543123252 in words is "one trillion, five hundred forty billion, five hundred forty-three million, one hundred twenty-three thousand, two hundred fifty-two".