18491573627904 has 352 divisors, whose sum is σ = 53569569464320. Its totient is φ = 5637155586048.

The previous prime is 18491573627899. The next prime is 18491573627951. The reversal of 18491573627904 is 40972637519481.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4478460912 + ... + 4478465040.

It is a 2-persistent number, because it is pandigital, and so is 2⋅18491573627904 = 36983147255808, but 3⋅18491573627904 = 55474720883712 is not.

Almost surely, 2^{18491573627904} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18491573627904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784784732160).

18491573627904 is an abundant number, since it is smaller than the sum of its proper divisors (35077995836416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18491573627904 is a wasteful number, since it uses less digits than its factorization.

18491573627904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175 (or 5157 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 66.

The spelling of 18491573627904 in words is "eighteen trillion, four hundred ninety-one billion, five hundred seventy-three million, six hundred twenty-seven thousand, nine hundred four".