3621689947819 has 2 divisors, whose sum is σ = 3621689947820. Its totient is φ = 3621689947818.

The previous prime is 3621689947817. The next prime is 3621689947829. The reversal of 3621689947819 is 9187499861263.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3621689947819 - 2¹ = 3621689947817 is a prime.

It is a super-2 number, since 2×3621689947819² (a number of 26 digits) contains 22 as substring.

Together with 3621689947817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3621689947817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810844973909 + 1810844973910.

It is an arithmetic number, because the mean of its divisors is an integer number (1810844973910).

Almost surely, 2^{3621689947819} is an apocalyptic number.

3621689947819 is a deficient number, since it is larger than the sum of its proper divisors (1).

3621689947819 is an equidigital number, since it uses as much as digits as its factorization.

3621689947819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282175488, while the sum is 73.

The spelling of 3621689947819 in words is "three trillion, six hundred twenty-one billion, six hundred eighty-nine million, nine hundred forty-seven thousand, eight hundred nineteen".