1251345540123 has 48 divisors (see below), whose sum is σ = 2073120132096. Its totient is φ = 712495206720.

The previous prime is 1251345540097. The next prime is 1251345540127. The reversal of 1251345540123 is 3210455431521.

1251345540123 is a `hidden beast` number, since 1 + 2 + 51 + 3 + 45 + 540 + 1 + 23 = 666.

It is not a de Polignac number, because 1251345540123 - 2⁵ = 1251345540091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251345540127) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20249290 + ... + 20310992.

It is an arithmetic number, because the mean of its divisors is an integer number (43190002752).

Almost surely, 2^{1251345540123} is an apocalyptic number.

1251345540123 is a deficient number, since it is larger than the sum of its proper divisors (821774591973).

1251345540123 is a wasteful number, since it uses less digits than its factorization.

1251345540123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62864 (or 62861 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 1251345540123 in words is "one trillion, two hundred fifty-one billion, three hundred forty-five million, five hundred forty thousand, one hundred twenty-three".