20543642631067 has 2 divisors, whose sum is σ = 20543642631068. Its totient is φ = 20543642631066.

The previous prime is 20543642630999. The next prime is 20543642631103. The reversal of 20543642631067 is 76013624634502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20543642631067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20543642631067.

It is not a weakly prime, because it can be changed into another prime (20543649631067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271821315533 + 10271821315534.

It is an arithmetic number, because the mean of its divisors is an integer number (10271821315534).

Almost surely, 2^{20543642631067} is an apocalyptic number.

20543642631067 is a deficient number, since it is larger than the sum of its proper divisors (1).

20543642631067 is an equidigital number, since it uses as much as digits as its factorization.

20543642631067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 20543642631067 in words is "twenty trillion, five hundred forty-three billion, six hundred forty-two million, six hundred thirty-one thousand, sixty-seven".