19918134807 has 8 divisors (see below), whose sum is σ = 26559254784. Its totient is φ = 13277885688.

The previous prime is 19918134799. The next prime is 19918134823. The reversal of 19918134807 is 70843181991.

It is a happy number.

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

It is not a de Polignac number, because 19918134807 - 2³ = 19918134799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19918134807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19918134107) 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, 162333 + ... + 257270.

It is an arithmetic number, because the mean of its divisors is an integer number (3319906848).

Almost surely, 2^19918134807 is an apocalyptic number.

19918134807 is a deficient number, since it is larger than the sum of its proper divisors (6641119977).

19918134807 is a wasteful number, since it uses less digits than its factorization.

19918134807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435429.

The product of its (nonzero) digits is 435456, while the sum is 51.

The spelling of 19918134807 in words is "nineteen billion, nine hundred eighteen million, one hundred thirty-four thousand, eight hundred seven".