1297985155560 has 256 divisors, whose sum is σ = 4463159097600. Its totient is φ = 335288595456.

The previous prime is 1297985155547. The next prime is 1297985155573. The reversal of 1297985155560 is 655515897921.

1297985155560 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 9 + 8 + 515 + 55 + 60 = 666.

It is an interprime number because it is at equal distance from previous prime (1297985155547) and next prime (1297985155573).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8999374 + ... + 9142466.

It is an arithmetic number, because the mean of its divisors is an integer number (17434215225).

Almost surely, 2^{1297985155560} is an apocalyptic number.

1297985155560 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 1297985155560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2231579548800).

1297985155560 is an abundant number, since it is smaller than the sum of its proper divisors (3165173942040).

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

1297985155560 is a wasteful number, since it uses less digits than its factorization.

1297985155560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143377 (or 143367 counting only the distinct ones).

The product of its (nonzero) digits is 34020000, while the sum is 63.

The spelling of 1297985155560 in words is "one trillion, two hundred ninety-seven billion, nine hundred eighty-five million, one hundred fifty-five thousand, five hundred sixty".