1995447235609 has 3 divisors (see below), whose sum is σ = 1995448648213. Its totient is φ = 1995445823006.

The previous prime is 1995447235583. The next prime is 1995447235619. The reversal of 1995447235609 is 9065327445991.

The square root of 1995447235609 is 1412603.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1995447235609 - 2⁵ = 1995447235577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1995447235619) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 706302 + ... + 2118904.

Almost surely, 2^{1995447235609} is an apocalyptic number.

1995447235609 is the 1412603-rd square number.

1995447235609 is the 706302-nd centered octagonal number.

It is an amenable number.

1995447235609 is a deficient number, since it is larger than the sum of its proper divisors (1412604).

1995447235609 is an frugal number, since it uses more digits than its factorization.

1995447235609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825206 (or 1412603 counting only the distinct ones).

The product of its (nonzero) digits is 73483200, while the sum is 64.

Multiplying 1995447235609 by its sum of digits (64), we get a square (127708623078976 = 11300824²).

The spelling of 1995447235609 in words is "one trillion, nine hundred ninety-five billion, four hundred forty-seven million, two hundred thirty-five thousand, six hundred nine".