3621689947817 has 2 divisors, whose sum is σ = 3621689947818. Its totient is φ = 3621689947816.

The previous prime is 3621689947807. The next prime is 3621689947819. The reversal of 3621689947817 is 7187499861263.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2286685328041 + 1335004619776 = 1512179^2 + 1155424^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621689947817 - 2²⁸ = 3621421512361 is a prime.

Together with 3621689947819, 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 (3621689947819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810844973908 + 1810844973909.

It is an arithmetic number, because the mean of its divisors is an integer number (1810844973909).

Almost surely, 2^{3621689947817} is an apocalyptic number.

It is an amenable number.

3621689947817 is a deficient number, since it is larger than the sum of its proper divisors (1).

3621689947817 is an equidigital number, since it uses as much as digits as its factorization.

3621689947817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219469824, while the sum is 71.

The spelling of 3621689947817 in words is "three trillion, six hundred twenty-one billion, six hundred eighty-nine million, nine hundred forty-seven thousand, eight hundred seventeen".