19621918005 has 32 divisors (see below), whose sum is σ = 31749193728. Its totient is φ = 10347643200.

The previous prime is 19621918003. The next prime is 19621918009. The reversal of 19621918005 is 50081912691.

It is not a de Polignac number, because 19621918005 - 2¹ = 19621918003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19621918003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 457950 + ... + 498960.

It is an arithmetic number, because the mean of its divisors is an integer number (992162304).

Almost surely, 2^19621918005 is an apocalyptic number.

19621918005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19621918005 is a deficient number, since it is larger than the sum of its proper divisors (12127275723).

19621918005 is a wasteful number, since it uses less digits than its factorization.

19621918005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41377.

The product of its (nonzero) digits is 38880, while the sum is 42.

The spelling of 19621918005 in words is "nineteen billion, six hundred twenty-one million, nine hundred eighteen thousand, five".