20164537565823 has 32 divisors (see below), whose sum is σ = 32929431192576. Its totient is φ = 10723729218048.

The previous prime is 20164537565813. The next prime is 20164537565833. The reversal of 20164537565823 is 32856573546102.

It is an interprime number because it is at equal distance from previous prime (20164537565813) and next prime (20164537565833).

It is not a de Polignac number, because 20164537565823 - 2¹⁴ = 20164537549439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164537565813) 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 in 31 ways as a sum of consecutive naturals, for example, 564151386 + ... + 564187127.

It is an arithmetic number, because the mean of its divisors is an integer number (1029044724768).

Almost surely, 2^{20164537565823} is an apocalyptic number.

20164537565823 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20164537565823 is a deficient number, since it is larger than the sum of its proper divisors (12764893626753).

20164537565823 is a wasteful number, since it uses less digits than its factorization.

20164537565823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128338583.

The product of its (nonzero) digits is 36288000, while the sum is 57.

The spelling of 20164537565823 in words is "twenty trillion, one hundred sixty-four billion, five hundred thirty-seven million, five hundred sixty-five thousand, eight hundred twenty-three".