3123665721347 has 2 divisors, whose sum is σ = 3123665721348. Its totient is φ = 3123665721346.

The previous prime is 3123665721317. The next prime is 3123665721359. The reversal of 3123665721347 is 7431275663213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3123665721347 - 2⁸ = 3123665721091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3123665721295 and 3123665721304.

It is not a weakly prime, because it can be changed into another prime (3123665721307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561832860673 + 1561832860674.

It is an arithmetic number, because the mean of its divisors is an integer number (1561832860674).

Almost surely, 2^{3123665721347} is an apocalyptic number.

3123665721347 is a deficient number, since it is larger than the sum of its proper divisors (1).

3123665721347 is an equidigital number, since it uses as much as digits as its factorization.

3123665721347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 50.

The spelling of 3123665721347 in words is "three trillion, one hundred twenty-three billion, six hundred sixty-five million, seven hundred twenty-one thousand, three hundred forty-seven".