1251325543040 has 64 divisors (see below), whose sum is σ = 3020493490560. Its totient is φ = 495670674432.

The previous prime is 1251325543021. The next prime is 1251325543063. The reversal of 1251325543040 is 403455231521.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1251325543040² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9425324 + ... + 9557163.

It is an arithmetic number, because the mean of its divisors is an integer number (47195210790).

Almost surely, 2^{1251325543040} is an apocalyptic number.

1251325543040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251325543040 is an abundant number, since it is smaller than the sum of its proper divisors (1769167947520).

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

1251325543040 is a wasteful number, since it uses less digits than its factorization.

1251325543040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18982609 (or 18982597 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 1251325543040 in words is "one trillion, two hundred fifty-one billion, three hundred twenty-five million, five hundred forty-three thousand, forty".