1995953321780 has 96 divisors (see below), whose sum is σ = 4582533650688. Its totient is φ = 724217472000.

The previous prime is 1995953321753. The next prime is 1995953321783. The reversal of 1995953321780 is 871233595991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995953321783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 451264649 + ... + 451269071.

It is an arithmetic number, because the mean of its divisors is an integer number (47734725528).

Almost surely, 2^{1995953321780} is an apocalyptic number.

1995953321780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1995953321780 is an abundant number, since it is smaller than the sum of its proper divisors (2586580328908).

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

1995953321780 is a wasteful number, since it uses less digits than its factorization.

1995953321780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8457 (or 8455 counting only the distinct ones).

The product of its (nonzero) digits is 18370800, while the sum is 62.

The spelling of 1995953321780 in words is "one trillion, nine hundred ninety-five billion, nine hundred fifty-three million, three hundred twenty-one thousand, seven hundred eighty".