20543642630999 has 2 divisors, whose sum is σ = 20543642631000. Its totient is φ = 20543642630998.

The previous prime is 20543642630911. The next prime is 20543642631067. The reversal of 20543642630999 is 99903624634502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20543642630999 - 2²⁰ = 20543641582423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20543642330999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271821315499 + 10271821315500.

It is an arithmetic number, because the mean of its divisors is an integer number (10271821315500).

Almost surely, 2^{20543642630999} is an apocalyptic number.

20543642630999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20543642630999 is an equidigital number, since it uses as much as digits as its factorization.

20543642630999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75582720, while the sum is 62.

The spelling of 20543642630999 in words is "twenty trillion, five hundred forty-three billion, six hundred forty-two million, six hundred thirty thousand, nine hundred ninety-nine".