18919226067 has 32 divisors (see below), whose sum is σ = 31025585664. Its totient is φ = 10008230400.

The previous prime is 18919226059. The next prime is 18919226069. The reversal of 18919226067 is 76062291981.

It is not a de Polignac number, because 18919226067 - 2³ = 18919226059 is a prime.

It is a super-2 number, since 2×18919226067² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (18919226069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 412609 + ... + 456162.

It is an arithmetic number, because the mean of its divisors is an integer number (969549552).

Almost surely, 2^18919226067 is an apocalyptic number.

18919226067 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18919226067 is a deficient number, since it is larger than the sum of its proper divisors (12106359597).

18919226067 is a wasteful number, since it uses less digits than its factorization.

18919226067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868859.

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 18919226067 in words is "eighteen billion, nine hundred nineteen million, two hundred twenty-six thousand, sixty-seven".