3620306643721 has 2 divisors, whose sum is σ = 3620306643722. Its totient is φ = 3620306643720.

The previous prime is 3620306643697. The next prime is 3620306643731. The reversal of 3620306643721 is 1273466030263.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3317516174025 + 302790469696 = 1821405^2 + 550264^2 .

It is a cyclic number.

It is not a de Polignac number, because 3620306643721 - 2⁹ = 3620306643209 is a prime.

It is not a weakly prime, because it can be changed into another prime (3620306643731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810153321860 + 1810153321861.

It is an arithmetic number, because the mean of its divisors is an integer number (1810153321861).

Almost surely, 2^{3620306643721} is an apocalyptic number.

It is an amenable number.

3620306643721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3620306643721 is an equidigital number, since it uses as much as digits as its factorization.

3620306643721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 43.

The spelling of 3620306643721 in words is "three trillion, six hundred twenty billion, three hundred six million, six hundred forty-three thousand, seven hundred twenty-one".