1797871557636 has 240 divisors, whose sum is σ = 6002653168512. Its totient is φ = 455589619200.

The previous prime is 1797871557631. The next prime is 1797871557649. The reversal of 1797871557636 is 6367551787971.

1797871557636 is a `hidden beast` number, since 1 + 7 + 9 + 7 + 8 + 7 + 1 + 557 + 63 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (1797871557631) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 144030 + ... + 1901706.

Almost surely, 2^{1797871557636} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1797871557636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3001326584256).

1797871557636 is an abundant number, since it is smaller than the sum of its proper divisors (4204781610876).

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

1797871557636 is a wasteful number, since it uses less digits than its factorization.

1797871557636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757752 (or 1757741 counting only the distinct ones).

The product of its digits is 466754400, while the sum is 72.

The spelling of 1797871557636 in words is "one trillion, seven hundred ninety-seven billion, eight hundred seventy-one million, five hundred fifty-seven thousand, six hundred thirty-six".