2154241664257 has 2 divisors, whose sum is σ = 2154241664258. Its totient is φ = 2154241664256.

The previous prime is 2154241664243. The next prime is 2154241664293. The reversal of 2154241664257 is 7524661424512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1973460230401 + 180781433856 = 1404799^2 + 425184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154241664257 is a prime.

It is a super-2 number, since 2×2154241664257² (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 2154241664257.

It is not a weakly prime, because it can be changed into another prime (2154241664857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077120832128 + 1077120832129.

It is an arithmetic number, because the mean of its divisors is an integer number (1077120832129).

Almost surely, 2^{2154241664257} is an apocalyptic number.

It is an amenable number.

2154241664257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154241664257 is an equidigital number, since it uses as much as digits as its factorization.

2154241664257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 49.

The spelling of 2154241664257 in words is "two trillion, one hundred fifty-four billion, two hundred forty-one million, six hundred sixty-four thousand, two hundred fifty-seven".