18971252219640 has 256 divisors, whose sum is σ = 69742209945600. Its totient is φ = 4029549428736.

The previous prime is 18971252219617. The next prime is 18971252219671. The reversal of 18971252219640 is 4691225217981.

It is a happy number.

18971252219640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7280229 + ... + 9536468.

It is an arithmetic number, because the mean of its divisors is an integer number (272430507600).

Almost surely, 2^{18971252219640} is an apocalyptic number.

18971252219640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18971252219640 is an abundant number, since it is smaller than the sum of its proper divisors (50770957725960).

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

18971252219640 is a wasteful number, since it uses less digits than its factorization.

18971252219640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16816814 (or 16816810 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 18971252219640 in words is "eighteen trillion, nine hundred seventy-one billion, two hundred fifty-two million, two hundred nineteen thousand, six hundred forty".