1297521611904 has 384 divisors, whose sum is σ = 4040613720000. Its totient is φ = 367833833472.

The previous prime is 1297521611861. The next prime is 1297521611923. The reversal of 1297521611904 is 4091161257921.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1968924727 + ... + 1968925385.

Almost surely, 2^{1297521611904} is an apocalyptic number.

1297521611904 is a gapful number since it is divisible by the number (14) 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 1297521611904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2020306860000).

1297521611904 is an abundant number, since it is smaller than the sum of its proper divisors (2743092108096).

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

1297521611904 is a wasteful number, since it uses less digits than its factorization.

1297521611904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 48.

The spelling of 1297521611904 in words is "one trillion, two hundred ninety-seven billion, five hundred twenty-one million, six hundred eleven thousand, nine hundred four".