19871816038656 has 72 divisors (see below), whose sum is σ = 53074894404000. Its totient is φ = 6600532463616.

The previous prime is 19871816038651. The next prime is 19871816038691. The reversal of 19871816038656 is 65683061817891.

It is not an unprimeable number, because it can be changed into a prime (19871816038651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45497781 + ... + 45932468.

Almost surely, 2^{19871816038656} is an apocalyptic number.

19871816038656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19871816038656 is an abundant number, since it is smaller than the sum of its proper divisors (33203078365344).

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

19871816038656 is an equidigital number, since it uses as much as digits as its factorization.

19871816038656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91430551 (or 91430537 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 69.

The spelling of 19871816038656 in words is "nineteen trillion, eight hundred seventy-one billion, eight hundred sixteen million, thirty-eight thousand, six hundred fifty-six".