2156511443316 has 12 divisors (see below), whose sum is σ = 5031860034432. Its totient is φ = 718837147768.

The previous prime is 2156511443311. The next prime is 2156511443329. The reversal of 2156511443316 is 6133441156512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156511443311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89854643460 + ... + 89854643483.

It is an arithmetic number, because the mean of its divisors is an integer number (419321669536).

Almost surely, 2^{2156511443316} is an apocalyptic number.

It is an amenable number.

2156511443316 is an abundant number, since it is smaller than the sum of its proper divisors (2875348591116).

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

2156511443316 is a wasteful number, since it uses less digits than its factorization.

2156511443316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179709286950 (or 179709286948 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

Adding to 2156511443316 its reverse (6133441156512), we get a palindrome (8289952599828).

The spelling of 2156511443316 in words is "two trillion, one hundred fifty-six billion, five hundred eleven million, four hundred forty-three thousand, three hundred sixteen".