2187688053656 has 64 divisors (see below), whose sum is σ = 5123780167680. Its totient is φ = 853963338240.

The previous prime is 2187688053653. The next prime is 2187688053703. The reversal of 2187688053656 is 6563508867812.

It is a junction number, because it is equal to n+sod(n) for n = 2187688053592 and 2187688053601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187688053653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37034870 + ... + 37093893.

It is an arithmetic number, because the mean of its divisors is an integer number (80059065120).

Almost surely, 2^{2187688053656} is an apocalyptic number.

It is an amenable number.

2187688053656 is an abundant number, since it is smaller than the sum of its proper divisors (2936092114024).

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

2187688053656 is a wasteful number, since it uses less digits than its factorization.

2187688053656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74128824 (or 74128820 counting only the distinct ones).

The product of its (nonzero) digits is 116121600, while the sum is 65.

The spelling of 2187688053656 in words is "two trillion, one hundred eighty-seven billion, six hundred eighty-eight million, fifty-three thousand, six hundred fifty-six".