20001549623807 has 2 divisors, whose sum is σ = 20001549623808. Its totient is φ = 20001549623806.

The previous prime is 20001549623777. The next prime is 20001549623827. The reversal of 20001549623807 is 70832694510002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001549623807 - 2⁶ = 20001549623743 is a prime.

It is a super-2 number, since 2×20001549623807² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001549623827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000774811903 + 10000774811904.

It is an arithmetic number, because the mean of its divisors is an integer number (10000774811904).

It is a 1-persistent number, because it is pandigital, but 2⋅20001549623807 = 40003099247614 is not.

Almost surely, 2^{20001549623807} is an apocalyptic number.

20001549623807 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001549623807 is an equidigital number, since it uses as much as digits as its factorization.

20001549623807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 20001549623807 in words is "twenty trillion, one billion, five hundred forty-nine million, six hundred twenty-three thousand, eight hundred seven".