1995664403 has 4 divisors (see below), whose sum is σ = 1999064760. Its totient is φ = 1992264048.

The previous prime is 1995664393. The next prime is 1995664409. The reversal of 1995664403 is 3044665991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1995664403 - 2⁴ = 1995664387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1995664409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699298 + ... + 1700471.

It is an arithmetic number, because the mean of its divisors is an integer number (499766190).

Almost surely, 2^1995664403 is an apocalyptic number.

1995664403 is a deficient number, since it is larger than the sum of its proper divisors (3400357).

1995664403 is an equidigital number, since it uses as much as digits as its factorization.

1995664403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400356.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 1995664403 is about 44672.8598032407. The cubic root of 1995664403 is about 1259.0099729129.

The spelling of 1995664403 in words is "one billion, nine hundred ninety-five million, six hundred sixty-four thousand, four hundred three".