513512453661 has 16 divisors (see below), whose sum is σ = 695711849280. Its totient is φ = 336870938880.

The previous prime is 513512453633. The next prime is 513512453687. The reversal of 513512453661 is 166354215315.

It is a happy number.

It is not a de Polignac number, because 513512453661 - 2⁹ = 513512453149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513512454661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5401750 + ... + 5495991.

It is an arithmetic number, because the mean of its divisors is an integer number (43481990580).

Almost surely, 2^513512453661 is an apocalyptic number.

It is an amenable number.

513512453661 is a deficient number, since it is larger than the sum of its proper divisors (182199395619).

513512453661 is a wasteful number, since it uses less digits than its factorization.

513512453661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10897996.

The product of its digits is 324000, while the sum is 42.

Adding to 513512453661 its reverse (166354215315), we get a palindrome (679866668976).

The spelling of 513512453661 in words is "five hundred thirteen billion, five hundred twelve million, four hundred fifty-three thousand, six hundred sixty-one".