3687720566443 has 2 divisors, whose sum is σ = 3687720566444. Its totient is φ = 3687720566442.

The previous prime is 3687720566363. The next prime is 3687720566447. The reversal of 3687720566443 is 3446650277863.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3687720566443 - 2⁹ = 3687720565931 is a prime.

It is not a weakly prime, because it can be changed into another prime (3687720566447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1843860283221 + 1843860283222.

It is an arithmetic number, because the mean of its divisors is an integer number (1843860283222).

Almost surely, 2^{3687720566443} is an apocalyptic number.

3687720566443 is a deficient number, since it is larger than the sum of its proper divisors (1).

3687720566443 is an equidigital number, since it uses as much as digits as its factorization.

3687720566443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 121927680, while the sum is 61.

The spelling of 3687720566443 in words is "three trillion, six hundred eighty-seven billion, seven hundred twenty million, five hundred sixty-six thousand, four hundred forty-three".