19713634406 has 4 divisors (see below), whose sum is σ = 29570451612. Its totient is φ = 9856817202.

The previous prime is 19713634387. The next prime is 19713634453. The reversal of 19713634406 is 60443631791.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4928408600 + ... + 4928408603.

It is an arithmetic number, because the mean of its divisors is an integer number (7392612903).

Almost surely, 2^19713634406 is an apocalyptic number.

19713634406 is a deficient number, since it is larger than the sum of its proper divisors (9856817206).

19713634406 is an equidigital number, since it uses as much as digits as its factorization.

19713634406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9856817205.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 19713634406 in words is "nineteen billion, seven hundred thirteen million, six hundred thirty-four thousand, four hundred six".