19540641690008 has 8 divisors (see below), whose sum is σ = 36638703168780. Its totient is φ = 9770320845000.

The previous prime is 19540641689957. The next prime is 19540641690047. The reversal of 19540641690008 is 80009614604591.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1221290105618 + ... + 1221290105633.

Almost surely, 2^{19540641690008} is an apocalyptic number.

It is an amenable number.

19540641690008 is a deficient number, since it is larger than the sum of its proper divisors (17098061478772).

19540641690008 is a wasteful number, since it uses less digits than its factorization.

19540641690008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442580211257 (or 2442580211253 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 19540641690008 in words is "nineteen trillion, five hundred forty billion, six hundred forty-one million, six hundred ninety thousand, eight".