1251422550440 has 64 divisors (see below), whose sum is σ = 2964998520000. Its totient is φ = 474046801920.

The previous prime is 1251422550353. The next prime is 1251422550481. The reversal of 1251422550440 is 440552241521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251422550440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1746200 + ... + 2356280.

It is an arithmetic number, because the mean of its divisors is an integer number (46328101875).

Almost surely, 2^{1251422550440} is an apocalyptic number.

1251422550440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251422550440 is an abundant number, since it is smaller than the sum of its proper divisors (1713575969560).

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

1251422550440 is a wasteful number, since it uses less digits than its factorization.

1251422550440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612810 (or 612806 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 35.

Adding to 1251422550440 its reverse (440552241521), we get a palindrome (1691974791961).

The spelling of 1251422550440 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-two million, five hundred fifty thousand, four hundred forty".