1988007815850 has 144 divisors (see below), whose sum is σ = 5835580540608. Its totient is φ = 438732564480.

The previous prime is 1988007815837. The next prime is 1988007815851. The reversal of 1988007815850 is 585187008891.

It is a super-2 number, since 2×1988007815850² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1988007815851) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 242599 + ... + 2008698.

Almost surely, 2^{1988007815850} is an apocalyptic number.

1988007815850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1988007815850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2917790270304).

1988007815850 is an abundant number, since it is smaller than the sum of its proper divisors (3847572724758).

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

1988007815850 is a wasteful number, since it uses less digits than its factorization.

1988007815850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251377 (or 2251343 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 60.

The spelling of 1988007815850 in words is "one trillion, nine hundred eighty-eight billion, seven million, eight hundred fifteen thousand, eight hundred fifty".