18419430646 has 16 divisors (see below), whose sum is σ = 28476686448. Its totient is φ = 8929958400.

The previous prime is 18419430637. The next prime is 18419430677. The reversal of 18419430646 is 64603491481.

It is a junction number, because it is equal to n+sod(n) for n = 18419430596 and 18419430605.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 675675 + ... + 702406.

It is an arithmetic number, because the mean of its divisors is an integer number (1779792903).

Almost surely, 2^18419430646 is an apocalyptic number.

18419430646 is a deficient number, since it is larger than the sum of its proper divisors (10057255802).

18419430646 is a wasteful number, since it uses less digits than its factorization.

18419430646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378287.

The product of its (nonzero) digits is 497664, while the sum is 46.

It can be divided in two parts, 184194 and 30646, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 18419430646 in words is "eighteen billion, four hundred nineteen million, four hundred thirty thousand, six hundred forty-six".