1998377268810 has 64 divisors (see below), whose sum is σ = 5436880686720. Its totient is φ = 466018341120.

The previous prime is 1998377268809. The next prime is 1998377268847. The reversal of 1998377268810 is 188627738991.

It is a super-2 number, since 2×1998377268810² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134835861 + ... + 134850680.

It is an arithmetic number, because the mean of its divisors is an integer number (84951260730).

Almost surely, 2^{1998377268810} is an apocalyptic number.

1998377268810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998377268810 is an abundant number, since it is smaller than the sum of its proper divisors (3438503417910).

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

1998377268810 is a wasteful number, since it uses less digits than its factorization.

1998377268810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269686583.

The product of its (nonzero) digits is 73156608, while the sum is 69.

It can be divided in two parts, 199837 and 7268810, that added together give a palindrome (7468647).

The spelling of 1998377268810 in words is "one trillion, nine hundred ninety-eight billion, three hundred seventy-seven million, two hundred sixty-eight thousand, eight hundred ten".