19889634506 has 8 divisors (see below), whose sum is σ = 34096516320. Its totient is φ = 8524129068.

The previous prime is 19889634497. The next prime is 19889634547. The reversal of 19889634506 is 60543698891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710344076 + ... + 710344103.

It is an arithmetic number, because the mean of its divisors is an integer number (4262064540).

Almost surely, 2^19889634506 is an apocalyptic number.

19889634506 is a deficient number, since it is larger than the sum of its proper divisors (14206881814).

19889634506 is a wasteful number, since it uses less digits than its factorization.

19889634506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420688188.

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 19889634506 in words is "nineteen billion, eight hundred eighty-nine million, six hundred thirty-four thousand, five hundred six".