20539354751999 has 2 divisors, whose sum is σ = 20539354752000. Its totient is φ = 20539354751998.

The previous prime is 20539354751941. The next prime is 20539354752043. The reversal of 20539354751999 is 99915745393502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20539354751999 - 2¹⁶ = 20539354686463 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20539354751099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269677375999 + 10269677376000.

It is an arithmetic number, because the mean of its divisors is an integer number (10269677376000).

Almost surely, 2^{20539354751999} is an apocalyptic number.

20539354751999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20539354751999 is an equidigital number, since it uses as much as digits as its factorization.

20539354751999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 413343000, while the sum is 71.

The spelling of 20539354751999 in words is "twenty trillion, five hundred thirty-nine billion, three hundred fifty-four million, seven hundred fifty-one thousand, nine hundred ninety-nine".