511105661687 has 2 divisors, whose sum is σ = 511105661688. Its totient is φ = 511105661686.

The previous prime is 511105661681. The next prime is 511105661699. The reversal of 511105661687 is 786166501115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 511105661687 - 2¹² = 511105657591 is a prime.

It is a super-2 number, since 2×511105661687² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511105661681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255552830843 + 255552830844.

It is an arithmetic number, because the mean of its divisors is an integer number (255552830844).

Almost surely, 2^511105661687 is an apocalyptic number.

511105661687 is a deficient number, since it is larger than the sum of its proper divisors (1).

511105661687 is an equidigital number, since it uses as much as digits as its factorization.

511105661687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 511105661687 in words is "five hundred eleven billion, one hundred five million, six hundred sixty-one thousand, six hundred eighty-seven".