2145661610201 has 2 divisors, whose sum is σ = 2145661610202. Its totient is φ = 2145661610200.

The previous prime is 2145661610171. The next prime is 2145661610203. The reversal of 2145661610201 is 1020161665412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1537104040000 + 608557570201 = 1239800^2 + 780101^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145661610201 - 2¹⁰ = 2145661609177 is a prime.

Together with 2145661610203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2145661610203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072830805100 + 1072830805101.

It is an arithmetic number, because the mean of its divisors is an integer number (1072830805101).

Almost surely, 2^{2145661610201} is an apocalyptic number.

It is an amenable number.

2145661610201 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145661610201 is an equidigital number, since it uses as much as digits as its factorization.

2145661610201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 2145661610201 in words is "two trillion, one hundred forty-five billion, six hundred sixty-one million, six hundred ten thousand, two hundred one".