1995888961920 has 128 divisors (see below), whose sum is σ = 7270738410240. Its totient is φ = 456203188224.

The previous prime is 1995888961909. The next prime is 1995888961991. The reversal of 1995888961920 is 291698885991.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74238382 + ... + 74265261.

It is an arithmetic number, because the mean of its divisors is an integer number (56802643830).

Almost surely, 2^{1995888961920} is an apocalyptic number.

1995888961920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1995888961920 is an abundant number, since it is smaller than the sum of its proper divisors (5274849448320).

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

1995888961920 is a wasteful number, since it uses less digits than its factorization.

1995888961920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148503672 (or 148503660 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 75.

The spelling of 1995888961920 in words is "one trillion, nine hundred ninety-five billion, eight hundred eighty-eight million, nine hundred sixty-one thousand, nine hundred twenty".