20343665111551 has 4 divisors (see below), whose sum is σ = 20343718301704. Its totient is φ = 20343611921400.

The previous prime is 20343665111507. The next prime is 20343665111569. The reversal of 20343665111551 is 15511156634302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20343665111551 - 2¹⁹ = 20343664587263 is a prime.

It is a super-2 number, since 2×20343665111551² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20343665111498 and 20343665111507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20343665111591) 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 3 ways as a sum of consecutive naturals, for example, 26017185 + ... + 26787706.

It is an arithmetic number, because the mean of its divisors is an integer number (5085929575426).

Almost surely, 2^{20343665111551} is an apocalyptic number.

20343665111551 is a deficient number, since it is larger than the sum of its proper divisors (53190153).

20343665111551 is an equidigital number, since it uses as much as digits as its factorization.

20343665111551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53190152.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 20343665111551 in words is "twenty trillion, three hundred forty-three billion, six hundred sixty-five million, one hundred eleven thousand, five hundred fifty-one".