1257422556540 has 96 divisors (see below), whose sum is σ = 3634676136000. Its totient is φ = 324559650816.

The previous prime is 1257422556497. The next prime is 1257422556547. The reversal of 1257422556540 is 456552247521.

It is a happy number.

It is a super-2 number, since 2×1257422556540² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1257422556540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257422556547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1038915 + ... + 1895834.

It is an arithmetic number, because the mean of its divisors is an integer number (37861209750).

Almost surely, 2^{1257422556540} is an apocalyptic number.

1257422556540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257422556540 is an abundant number, since it is smaller than the sum of its proper divisors (2377253579460).

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

1257422556540 is a wasteful number, since it uses less digits than its factorization.

1257422556540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934991 (or 2934989 counting only the distinct ones).

The product of its (nonzero) digits is 3360000, while the sum is 48.

The spelling of 1257422556540 in words is "one trillion, two hundred fifty-seven billion, four hundred twenty-two million, five hundred fifty-six thousand, five hundred forty".