2156690642688 has 216 divisors, whose sum is σ = 6284067762336. Its totient is φ = 711327744000.

The previous prime is 2156690642629. The next prime is 2156690642707. The reversal of 2156690642688 is 8862460966512.

2156690642688 is a `hidden beast` number, since 2 + 1 + 566 + 9 + 0 + 6 + 4 + 2 + 68 + 8 = 666.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 89399268 + ... + 89423388.

Almost surely, 2^{2156690642688} 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 2156690642688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3142033881168).

2156690642688 is an abundant number, since it is smaller than the sum of its proper divisors (4127377119648).

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

2156690642688 is a wasteful number, since it uses less digits than its factorization.

2156690642688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24551 (or 24534 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 63.

The spelling of 2156690642688 in words is "two trillion, one hundred fifty-six billion, six hundred ninety million, six hundred forty-two thousand, six hundred eighty-eight".