19950653605 has 4 divisors (see below), whose sum is σ = 23940784332. Its totient is φ = 15960522880.

The previous prime is 19950653579. The next prime is 19950653609. The reversal of 19950653605 is 50635605991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50635605991 = 29 ⋅1746055379.

It can be written as a sum of positive squares in 2 ways, for example, as 4120484481 + 15830169124 = 64191^2 + 125818^2 .

It is not a de Polignac number, because 19950653605 - 2⁵ = 19950653573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19950653609) 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, 1995065356 + ... + 1995065365.

It is an arithmetic number, because the mean of its divisors is an integer number (5985196083).

Almost surely, 2^19950653605 is an apocalyptic number.

It is an amenable number.

19950653605 is a deficient number, since it is larger than the sum of its proper divisors (3990130727).

19950653605 is an equidigital number, since it uses as much as digits as its factorization.

19950653605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990130726.

The product of its (nonzero) digits is 1093500, while the sum is 49.

The spelling of 19950653605 in words is "nineteen billion, nine hundred fifty million, six hundred fifty-three thousand, six hundred five".