1251078734142 has 48 divisors (see below), whose sum is σ = 2733231900672. Its totient is φ = 413566868880.

The previous prime is 1251078734141. The next prime is 1251078734149. The reversal of 1251078734142 is 2414378701521.

It is a happy number.

1251078734142 is a `hidden beast` number, since 12 + 510 + 7 + 87 + 3 + 4 + 1 + 42 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251078734141) 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 23 ways as a sum of consecutive naturals, for example, 812763 + ... + 1778409.

It is an arithmetic number, because the mean of its divisors is an integer number (56942331264).

Almost surely, 2^{1251078734142} is an apocalyptic number.

1251078734142 is an abundant number, since it is smaller than the sum of its proper divisors (1482153166530).

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

1251078734142 is a wasteful number, since it uses less digits than its factorization.

1251078734142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966253 (or 966250 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 1251078734142 in words is "one trillion, two hundred fifty-one billion, seventy-eight million, seven hundred thirty-four thousand, one hundred forty-two".