1995755661 has 12 divisors (see below), whose sum is σ = 2886431392. Its totient is φ = 1328808456.

The previous prime is 1995755639. The next prime is 1995755693. The reversal of 1995755661 is 1665575991.

1995755661 is a `hidden beast` number, since 1 + 9 + 9 + 5 + 75 + 566 + 1 = 666.

It is not a de Polignac number, because 1995755661 - 2²¹ = 1993658509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1995755598 and 1995755607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995755561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133801 + ... + 147966.

Almost surely, 2^1995755661 is an apocalyptic number.

It is an amenable number.

1995755661 is a deficient number, since it is larger than the sum of its proper divisors (890675731).

1995755661 is a wasteful number, since it uses less digits than its factorization.

1995755661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282560 (or 282557 counting only the distinct ones).

The product of its digits is 2551500, while the sum is 54.

The square root of 1995755661 is about 44673.8811947205. The cubic root of 1995755661 is about 1259.0291633440.

The spelling of 1995755661 in words is "one billion, nine hundred ninety-five million, seven hundred fifty-five thousand, six hundred sixty-one".