511212061666 has 16 divisors (see below), whose sum is σ = 772386955200. Its totient is φ = 253751621040.

The previous prime is 511212061651. The next prime is 511212061667. The reversal of 511212061666 is 666160212115.

It is a super-2 number, since 2×511212061666² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (511212061667) 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 7 ways as a sum of consecutive naturals, for example, 77185 + ... + 1014091.

It is an arithmetic number, because the mean of its divisors is an integer number (48274184700).

Almost surely, 2^511212061666 is an apocalyptic number.

511212061666 is a deficient number, since it is larger than the sum of its proper divisors (261174893534).

511212061666 is a wasteful number, since it uses less digits than its factorization.

511212061666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938889.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 511212061666 in words is "five hundred eleven billion, two hundred twelve million, sixty-one thousand, six hundred sixty-six".