1995915721392 has 440 divisors, whose sum is σ = 6070552501440. Its totient is φ = 634894848000.

The previous prime is 1995915721381. The next prime is 1995915721411. The reversal of 1995915721392 is 2931275195991.

1995915721392 is a `hidden beast` number, since 1 + 9 + 9 + 59 + 1 + 572 + 1 + 3 + 9 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 87 ways as a sum of consecutive naturals, for example, 2657677017 + ... + 2657677767.

Almost surely, 2^{1995915721392} is an apocalyptic number.

1995915721392 is a gapful number since it is divisible by the number (12) 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 1995915721392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3035276250720).

1995915721392 is an abundant number, since it is smaller than the sum of its proper divisors (4074636780048).

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

1995915721392 is an frugal number, since it uses more digits than its factorization.

1995915721392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 882 counting only the distinct ones).

The product of its digits is 13778100, while the sum is 63.

The spelling of 1995915721392 in words is "one trillion, nine hundred ninety-five billion, nine hundred fifteen million, seven hundred twenty-one thousand, three hundred ninety-two".