515521648423 has 4 divisors (see below), whose sum is σ = 515690730400. Its totient is φ = 515352566448.

The previous prime is 515521648409. The next prime is 515521648459. The reversal of 515521648423 is 324846125515.

It is a happy number.

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 515521648423 - 2⁵ = 515521648391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515521648483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84536415 + ... + 84542512.

It is an arithmetic number, because the mean of its divisors is an integer number (128922682600).

Almost surely, 2^515521648423 is an apocalyptic number.

515521648423 is a deficient number, since it is larger than the sum of its proper divisors (169081977).

515521648423 is a wasteful number, since it uses less digits than its factorization.

515521648423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169081976.

The product of its digits is 1152000, while the sum is 46.

The spelling of 515521648423 in words is "five hundred fifteen billion, five hundred twenty-one million, six hundred forty-eight thousand, four hundred twenty-three".