1998377268811 has 32 divisors (see below), whose sum is σ = 2562217256448. Its totient is φ = 1513517591040.

The previous prime is 1998377268809. The next prime is 1998377268847. The reversal of 1998377268811 is 1188627738991.

It is not a de Polignac number, because 1998377268811 - 2¹ = 1998377268809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998377268851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1851550 + ... + 2724883.

It is an arithmetic number, because the mean of its divisors is an integer number (80069289264).

Almost surely, 2^{1998377268811} is an apocalyptic number.

1998377268811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1998377268811 is a deficient number, since it is larger than the sum of its proper divisors (563839987637).

1998377268811 is a wasteful number, since it uses less digits than its factorization.

1998377268811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4576611.

The product of its digits is 73156608, while the sum is 70.

The spelling of 1998377268811 in words is "one trillion, nine hundred ninety-eight billion, three hundred seventy-seven million, two hundred sixty-eight thousand, eight hundred eleven".