1251125355138 has 16 divisors (see below), whose sum is σ = 2633948116320. Its totient is φ = 395092217376.

The previous prime is 1251125355101. The next prime is 1251125355211. The reversal of 1251125355138 is 8315535211521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251125355138.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5487391795 + ... + 5487392022.

It is an arithmetic number, because the mean of its divisors is an integer number (164621757270).

Almost surely, 2^{1251125355138} is an apocalyptic number.

1251125355138 is an abundant number, since it is smaller than the sum of its proper divisors (1382822761182).

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

1251125355138 is a wasteful number, since it uses less digits than its factorization.

1251125355138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10974783841.

The product of its digits is 180000, while the sum is 42.

The spelling of 1251125355138 in words is "one trillion, two hundred fifty-one billion, one hundred twenty-five million, three hundred fifty-five thousand, one hundred thirty-eight".