1251265251500 has 48 divisors (see below), whose sum is σ = 2981196350496. Its totient is φ = 455005544000.

The previous prime is 1251265251487. The next prime is 1251265251503. The reversal of 1251265251500 is 51525621521.

It is a super-2 number, since 2×1251265251500² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1251265251503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113745887 + ... + 113756886.

It is an arithmetic number, because the mean of its divisors is an integer number (62108257302).

Almost surely, 2^{1251265251500} is an apocalyptic number.

1251265251500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251265251500 is an abundant number, since it is smaller than the sum of its proper divisors (1729931098996).

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

1251265251500 is a wasteful number, since it uses less digits than its factorization.

1251265251500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227502803 (or 227502791 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 35.

The spelling of 1251265251500 in words is "one trillion, two hundred fifty-one billion, two hundred sixty-five million, two hundred fifty-one thousand, five hundred".