1251038687880 has 128 divisors (see below), whose sum is σ = 3770256430080. Its totient is φ = 332088288000.

The previous prime is 1251038687837. The next prime is 1251038687909. The reversal of 1251038687880 is 887868301521.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1251038687880.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56222917 + ... + 56245163.

It is an arithmetic number, because the mean of its divisors is an integer number (29455128360).

Almost surely, 2^{1251038687880} is an apocalyptic number.

1251038687880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251038687880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1885128215040).

1251038687880 is an abundant number, since it is smaller than the sum of its proper divisors (2519217742200).

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

1251038687880 is a wasteful number, since it uses less digits than its factorization.

1251038687880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24379 (or 24375 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 57.

The spelling of 1251038687880 in words is "one trillion, two hundred fifty-one billion, thirty-eight million, six hundred eighty-seven thousand, eight hundred eighty".