1257517768440 has 32 divisors (see below), whose sum is σ = 3772553305680. Its totient is φ = 335338071552.

The previous prime is 1257517768399. The next prime is 1257517768453. The reversal of 1257517768440 is 448677157521.

It is a super-3 number, since 3×1257517768440³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5239657249 + ... + 5239657488.

Almost surely, 2^{1257517768440} is an apocalyptic number.

1257517768440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257517768440 is an abundant number, since it is smaller than the sum of its proper divisors (2515035537240).

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

1257517768440 is a wasteful number, since it uses less digits than its factorization.

1257517768440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10479314751 (or 10479314747 counting only the distinct ones).

The product of its (nonzero) digits is 13171200, while the sum is 57.

The spelling of 1257517768440 in words is "one trillion, two hundred fifty-seven billion, five hundred seventeen million, seven hundred sixty-eight thousand, four hundred forty".