2156316636241 has 4 divisors (see below), whose sum is σ = 2283158791332. Its totient is φ = 2029474481152.

The previous prime is 2156316636169. The next prime is 2156316636283. The reversal of 2156316636241 is 1426366136512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1966333107600 + 189983528641 = 1402260^2 + 435871^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156316636241 - 2¹⁹ = 2156316111953 is a prime.

It is a super-2 number, since 2×2156316636241² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2156316636191 and 2156316636200.

It is not an unprimeable number, because it can be changed into a prime (2156310636241) 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, 63421077520 + ... + 63421077553.

It is an arithmetic number, because the mean of its divisors is an integer number (570789697833).

Almost surely, 2^{2156316636241} is an apocalyptic number.

It is an amenable number.

2156316636241 is a deficient number, since it is larger than the sum of its proper divisors (126842155091).

2156316636241 is a wasteful number, since it uses less digits than its factorization.

2156316636241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126842155090.

The product of its digits is 933120, while the sum is 46.

The spelling of 2156316636241 in words is "two trillion, one hundred fifty-six billion, three hundred sixteen million, six hundred thirty-six thousand, two hundred forty-one".