513366121643 has 4 divisors (see below), whose sum is σ = 513400620720. Its totient is φ = 513331622568.

The previous prime is 513366121627. The next prime is 513366121651. The reversal of 513366121643 is 346121663315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346121663315 = 5 ⋅69224332663.

It is a cyclic number.

It is not a de Polignac number, because 513366121643 - 2⁴ = 513366121627 is a prime.

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 513366121643.

It is not an unprimeable number, because it can be changed into a prime (513366121673) 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, 17227208 + ... + 17256981.

It is an arithmetic number, because the mean of its divisors is an integer number (128350155180).

Almost surely, 2^513366121643 is an apocalyptic number.

513366121643 is a deficient number, since it is larger than the sum of its proper divisors (34499077).

513366121643 is a wasteful number, since it uses less digits than its factorization.

513366121643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34499076.

The product of its digits is 233280, while the sum is 41.

Adding to 513366121643 its reverse (346121663315), we get a palindrome (859487784958).

The spelling of 513366121643 in words is "five hundred thirteen billion, three hundred sixty-six million, one hundred twenty-one thousand, six hundred forty-three".