1987553383125 has 80 divisors (see below), whose sum is σ = 3332297973312. Its totient is φ = 1053400000000.

The previous prime is 1987553383117. The next prime is 1987553383139. The reversal of 1987553383125 is 5213833557891.

It is not a de Polignac number, because 1987553383125 - 2³ = 1987553383117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 216953545 + ... + 216962705.

Almost surely, 2^{1987553383125} is an apocalyptic number.

1987553383125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1987553383125 is a deficient number, since it is larger than the sum of its proper divisors (1344744590187).

1987553383125 is an equidigital number, since it uses as much as digits as its factorization.

1987553383125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9896 (or 9881 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 60.

The spelling of 1987553383125 in words is "one trillion, nine hundred eighty-seven billion, five hundred fifty-three million, three hundred eighty-three thousand, one hundred twenty-five".