1995389685520 has 1280 divisors, whose sum is σ = 6436516608000. Its totient is φ = 568995840000.

The previous prime is 1995389685481. The next prime is 1995389685547. The reversal of 1995389685520 is 255869835991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a self number, because there is not a number n which added to its sum of digits gives 1995389685520.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 19756333470 + ... + 19756333570.

It is an arithmetic number, because the mean of its divisors is an integer number (5028528600).

Almost surely, 2^{1995389685520} is an apocalyptic number.

1995389685520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1995389685520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3218258304000).

1995389685520 is an abundant number, since it is smaller than the sum of its proper divisors (4441126922480).

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

1995389685520 is a wasteful number, since it uses less digits than its factorization.

1995389685520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 209952000, while the sum is 70.

The spelling of 1995389685520 in words is "one trillion, nine hundred ninety-five billion, three hundred eighty-nine million, six hundred eighty-five thousand, five hundred twenty".