30720726643 has 2 divisors, whose sum is σ = 30720726644. Its totient is φ = 30720726642.

The previous prime is 30720726623. The next prime is 30720726679. The reversal of 30720726643 is 34662702703.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30720726643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30720726596 and 30720726605.

It is not a weakly prime, because it can be changed into another prime (30720726623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15360363321 + 15360363322.

It is an arithmetic number, because the mean of its divisors is an integer number (15360363322).

Almost surely, 2^30720726643 is an apocalyptic number.

30720726643 is a deficient number, since it is larger than the sum of its proper divisors (1).

30720726643 is an equidigital number, since it uses as much as digits as its factorization.

30720726643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 40.

The spelling of 30720726643 in words is "thirty billion, seven hundred twenty million, seven hundred twenty-six thousand, six hundred forty-three".