19694202638 has 8 divisors (see below), whose sum is σ = 32226877080. Its totient is φ = 8951910280.

The previous prime is 19694202631. The next prime is 19694202643. The reversal of 19694202638 is 83620249691.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19694202631) 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, 447595493 + ... + 447595536.

It is an arithmetic number, because the mean of its divisors is an integer number (4028359635).

Almost surely, 2^19694202638 is an apocalyptic number.

19694202638 is a deficient number, since it is larger than the sum of its proper divisors (12532674442).

19694202638 is a wasteful number, since it uses less digits than its factorization.

19694202638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895191042.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 19694202638 in words is "nineteen billion, six hundred ninety-four million, two hundred two thousand, six hundred thirty-eight".