1002155131998 has 12 divisors (see below), whose sum is σ = 2171336119368. Its totient is φ = 334051710660.

The previous prime is 1002155131937. The next prime is 1002155132039. The reversal of 1002155131998 is 8991315512001.

It is a happy number.

1002155131998 is a `hidden beast` number, since 1 + 0 + 0 + 2 + 1 + 551 + 3 + 1 + 9 + 98 = 666.

1002155131998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27837642538 + ... + 27837642573.

It is an arithmetic number, because the mean of its divisors is an integer number (180944676614).

Almost surely, 2^{1002155131998} is an apocalyptic number.

1002155131998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1002155131998 is an abundant number, since it is smaller than the sum of its proper divisors (1169180987370).

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

1002155131998 is a wasteful number, since it uses less digits than its factorization.

1002155131998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55675285119 (or 55675285116 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 45.

The spelling of 1002155131998 in words is "one trillion, two billion, one hundred fifty-five million, one hundred thirty-one thousand, nine hundred ninety-eight".