1981484051757 has 16 divisors (see below), whose sum is σ = 3178320284160. Its totient is φ = 1072683095472.

The previous prime is 1981484051713. The next prime is 1981484051773. The reversal of 1981484051757 is 7571504841891.

It is a happy number.

It is not a de Polignac number, because 1981484051757 - 2¹² = 1981484047661 is a prime.

It is a super-3 number, since 3×1981484051757³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1981484051757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981484051797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2483062323 + ... + 2483063120.

It is an arithmetic number, because the mean of its divisors is an integer number (198645017760).

Almost surely, 2^{1981484051757} is an apocalyptic number.

It is an amenable number.

1981484051757 is a deficient number, since it is larger than the sum of its proper divisors (1196836232403).

1981484051757 is a wasteful number, since it uses less digits than its factorization.

1981484051757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4966125472.

The product of its (nonzero) digits is 11289600, while the sum is 60.

The spelling of 1981484051757 in words is "one trillion, nine hundred eighty-one billion, four hundred eighty-four million, fifty-one thousand, seven hundred fifty-seven".