13500420643 has 2 divisors, whose sum is σ = 13500420644. Its totient is φ = 13500420642.

The previous prime is 13500420617. The next prime is 13500420691. The reversal of 13500420643 is 34602400531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13500420643 - 2⁵ = 13500420611 is a prime.

It is a super-2 number, since 2×13500420643² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13500420343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6750210321 + 6750210322.

It is an arithmetic number, because the mean of its divisors is an integer number (6750210322).

Almost surely, 2^13500420643 is an apocalyptic number.

13500420643 is a deficient number, since it is larger than the sum of its proper divisors (1).

13500420643 is an equidigital number, since it uses as much as digits as its factorization.

13500420643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 28.

The spelling of 13500420643 in words is "thirteen billion, five hundred million, four hundred twenty thousand, six hundred forty-three".