1995676643988 has 36 divisors (see below), whose sum is σ = 5341369842900. Its totient is φ = 626094633216.

The previous prime is 1995676643981. The next prime is 1995676643999. The reversal of 1995676643988 is 8893466765991.

1995676643988 is a `hidden beast` number, since 1 + 9 + 9 + 567 + 6 + 6 + 43 + 9 + 8 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 967748322564 + 1027928321424 = 983742^2 + 1013868^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995676643981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1630454163 + ... + 1630455386.

It is an arithmetic number, because the mean of its divisors is an integer number (148371384525).

Almost surely, 2^{1995676643988} is an apocalyptic number.

1995676643988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1995676643988 is an abundant number, since it is smaller than the sum of its proper divisors (3345693198912).

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

1995676643988 is a wasteful number, since it uses less digits than its factorization.

1995676643988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260909576 (or 3260909571 counting only the distinct ones).

The product of its digits is 4232632320, while the sum is 81.

The spelling of 1995676643988 in words is "one trillion, nine hundred ninety-five billion, six hundred seventy-six million, six hundred forty-three thousand, nine hundred eighty-eight".