511020660631 has 16 divisors (see below), whose sum is σ = 555315425280. Its totient is φ = 467456899680.

The previous prime is 511020660629. The next prime is 511020660701. The reversal of 511020660631 is 136066020115.

It is a cyclic number.

It is not a de Polignac number, because 511020660631 - 2¹ = 511020660629 is a prime.

It is a super-2 number, since 2×511020660631² (a number of 24 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 = 511020660593 and 511020660602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511020661631) 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, 261760 + ... + 1044298.

It is an arithmetic number, because the mean of its divisors is an integer number (34707214080).

Almost surely, 2^511020660631 is an apocalyptic number.

511020660631 is a deficient number, since it is larger than the sum of its proper divisors (44294764649).

511020660631 is a wasteful number, since it uses less digits than its factorization.

511020660631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783006.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 511020660631 its reverse (136066020115), we get a palindrome (647086680746).

The spelling of 511020660631 in words is "five hundred eleven billion, twenty million, six hundred sixty thousand, six hundred thirty-one".