2156661450313 has 2 divisors, whose sum is σ = 2156661450314. Its totient is φ = 2156661450312.

The previous prime is 2156661450253. The next prime is 2156661450341. The reversal of 2156661450313 is 3130541666512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1753116346809 + 403545103504 = 1324053^2 + 635252^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156661450313 - 2¹³ = 2156661442121 is a prime.

It is a super-2 number, since 2×2156661450313² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2156661450313.

It is not a weakly prime, because it can be changed into another prime (2156661450343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078330725156 + 1078330725157.

It is an arithmetic number, because the mean of its divisors is an integer number (1078330725157).

Almost surely, 2^{2156661450313} is an apocalyptic number.

It is an amenable number.

2156661450313 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156661450313 is an equidigital number, since it uses as much as digits as its factorization.

2156661450313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 2156661450313 in words is "two trillion, one hundred fifty-six billion, six hundred sixty-one million, four hundred fifty thousand, three hundred thirteen".