2196957522581 has 2 divisors, whose sum is σ = 2196957522582. Its totient is φ = 2196957522580.

The previous prime is 2196957522569. The next prime is 2196957522611. The reversal of 2196957522581 is 1852257596912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1329155352100 + 867802170481 = 1152890^2 + 931559^2 .

It is a cyclic number.

It is not a de Polignac number, because 2196957522581 - 2⁶ = 2196957522517 is a prime.

It is a super-2 number, since 2×2196957522581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2196953522581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098478761290 + 1098478761291.

It is an arithmetic number, because the mean of its divisors is an integer number (1098478761291).

Almost surely, 2^{2196957522581} is an apocalyptic number.

It is an amenable number.

2196957522581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2196957522581 is an equidigital number, since it uses as much as digits as its factorization.

2196957522581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216000, while the sum is 62.

The spelling of 2196957522581 in words is "two trillion, one hundred ninety-six billion, nine hundred fifty-seven million, five hundred twenty-two thousand, five hundred eighty-one".