511105661688 has 16 divisors (see below), whose sum is σ = 1277764154280. Its totient is φ = 170368553888.

The previous prime is 511105661687. The next prime is 511105661699. The reversal of 511105661688 is 886166501115.

It is a super-2 number, since 2×511105661688² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511105661681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10648034595 + ... + 10648034642.

Almost surely, 2^511105661688 is an apocalyptic number.

It is an amenable number.

511105661688 is an abundant number, since it is smaller than the sum of its proper divisors (766658492592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

511105661688 is a wasteful number, since it uses less digits than its factorization.

511105661688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21296069246 (or 21296069242 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 48.

The spelling of 511105661688 in words is "five hundred eleven billion, one hundred five million, six hundred sixty-one thousand, six hundred eighty-eight".