1297556753920 has 240 divisors, whose sum is σ = 3776386429728. Its totient is φ = 425533194240.

The previous prime is 1297556753887. The next prime is 1297556753951. The reversal of 1297556753920 is 293576557921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2660250 + ... + 3109990.

Almost surely, 2^{1297556753920} is an apocalyptic number.

1297556753920 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 1297556753920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1888193214864).

1297556753920 is an abundant number, since it is smaller than the sum of its proper divisors (2478829675808).

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

1297556753920 is an equidigital number, since it uses as much as digits as its factorization.

1297556753920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449801 (or 449778 counting only the distinct ones).

The product of its (nonzero) digits is 35721000, while the sum is 61.

The spelling of 1297556753920 in words is "one trillion, two hundred ninety-seven billion, five hundred fifty-six million, seven hundred fifty-three thousand, nine hundred twenty".