1981332085020 has 24 divisors (see below), whose sum is σ = 5547729838224. Its totient is φ = 528355222656.

The previous prime is 1981332084989. The next prime is 1981332085021. The reversal of 1981332085020 is 205802331891.

It is a happy number.

It is a super-3 number, since 3×1981332085020³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981332085021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16511100649 + ... + 16511100768.

It is an arithmetic number, because the mean of its divisors is an integer number (231155409926).

Almost surely, 2^{1981332085020} is an apocalyptic number.

1981332085020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1981332085020 is an abundant number, since it is smaller than the sum of its proper divisors (3566397753204).

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

1981332085020 is a wasteful number, since it uses less digits than its factorization.

1981332085020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33022201429 (or 33022201427 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 1981332085020 in words is "one trillion, nine hundred eighty-one billion, three hundred thirty-two million, eighty-five thousand, twenty".