1251263775125 has 32 divisors (see below), whose sum is σ = 1921941176064. Its totient is φ = 792008712000.

The previous prime is 1251263775121. The next prime is 1251263775127. The reversal of 1251263775125 is 5215773621521.

It is not a de Polignac number, because 1251263775125 - 2² = 1251263775121 is a prime.

It is a super-2 number, since 2×1251263775125² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1251263775125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251263775121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54989231 + ... + 55011980.

It is an arithmetic number, because the mean of its divisors is an integer number (60060661752).

Almost surely, 2^{1251263775125} is an apocalyptic number.

It is an amenable number.

1251263775125 is a deficient number, since it is larger than the sum of its proper divisors (670677400939).

1251263775125 is a wasteful number, since it uses less digits than its factorization.

1251263775125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110001246 (or 110001236 counting only the distinct ones).

The product of its digits is 882000, while the sum is 47.

The spelling of 1251263775125 in words is "one trillion, two hundred fifty-one billion, two hundred sixty-three million, seven hundred seventy-five thousand, one hundred twenty-five".