19630550906 has 4 divisors (see below), whose sum is σ = 29445826362. Its totient is φ = 9815275452.

The previous prime is 19630550897. The next prime is 19630550923. The reversal of 19630550906 is 60905503691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60905503691 = 53 ⋅1149160447.

It can be written as a sum of positive squares in only one way, i.e., 19309603681 + 320947225 = 138959^2 + 17915^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4907637725 + ... + 4907637728.

Almost surely, 2^19630550906 is an apocalyptic number.

19630550906 is a deficient number, since it is larger than the sum of its proper divisors (9815275456).

19630550906 is an equidigital number, since it uses as much as digits as its factorization.

19630550906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9815275455.

The product of its (nonzero) digits is 218700, while the sum is 44.

The spelling of 19630550906 in words is "nineteen billion, six hundred thirty million, five hundred fifty thousand, nine hundred six".