511223115623 has 4 divisors (see below), whose sum is σ = 557697944328. Its totient is φ = 464748286920.

The previous prime is 511223115551. The next prime is 511223115629. The reversal of 511223115623 is 326511322115.

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 511223115623 - 2²⁰ = 511222067047 is a prime.

It is a super-2 number, since 2×511223115623² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 511223115623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511223115629) 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, 23237414336 + ... + 23237414357.

It is an arithmetic number, because the mean of its divisors is an integer number (139424486082).

Almost surely, 2^511223115623 is an apocalyptic number.

511223115623 is a deficient number, since it is larger than the sum of its proper divisors (46474828705).

511223115623 is a wasteful number, since it uses less digits than its factorization.

511223115623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46474828704.

The product of its digits is 10800, while the sum is 32.

Adding to 511223115623 its reverse (326511322115), we get a palindrome (837734437738).

The spelling of 511223115623 in words is "five hundred eleven billion, two hundred twenty-three million, one hundred fifteen thousand, six hundred twenty-three".