1898705556540 has 480 divisors, whose sum is σ = 6633170159616. Its totient is φ = 451493844480.

The previous prime is 1898705556497. The next prime is 1898705556551. The reversal of 1898705556540 is 456555078981.

1898705556540 is a `hidden beast` number, since 1 + 8 + 9 + 8 + 70 + 5 + 556 + 5 + 4 + 0 = 666.

It is a super-2 number, since 2×1898705556540² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 419786719 + ... + 419791241.

Almost surely, 2^{1898705556540} is an apocalyptic number.

1898705556540 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 1898705556540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3316585079808).

1898705556540 is an abundant number, since it is smaller than the sum of its proper divisors (4734464603076).

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

1898705556540 is a wasteful number, since it uses less digits than its factorization.

1898705556540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5231 (or 5220 counting only the distinct ones).

The product of its (nonzero) digits is 60480000, while the sum is 63.

The spelling of 1898705556540 in words is "one trillion, eight hundred ninety-eight billion, seven hundred five million, five hundred fifty-six thousand, five hundred forty".