19551638013 has 8 divisors (see below), whose sum is σ = 26773414368. Its totient is φ = 12682143504.

The previous prime is 19551637981. The next prime is 19551638131. The reversal of 19551638013 is 31083615591.

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

It is not a de Polignac number, because 19551638013 - 2⁵ = 19551637981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19551631013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88070331 + ... + 88070552.

It is an arithmetic number, because the mean of its divisors is an integer number (3346676796).

Almost surely, 2^19551638013 is an apocalyptic number.

It is an amenable number.

19551638013 is a deficient number, since it is larger than the sum of its proper divisors (7221776355).

19551638013 is a wasteful number, since it uses less digits than its factorization.

19551638013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176140923.

The product of its (nonzero) digits is 97200, while the sum is 42.

The spelling of 19551638013 in words is "nineteen billion, five hundred fifty-one million, six hundred thirty-eight thousand, thirteen".