505165611666 has 32 divisors (see below), whose sum is σ = 1011165861888. Its totient is φ = 168249494160.

The previous prime is 505165611593. The next prime is 505165611719. The reversal of 505165611666 is 666116561505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53787831 + ... + 53797221.

It is an arithmetic number, because the mean of its divisors is an integer number (31598933184).

Almost surely, 2^505165611666 is an apocalyptic number.

505165611666 is an abundant number, since it is smaller than the sum of its proper divisors (506000250222).

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

505165611666 is a wasteful number, since it uses less digits than its factorization.

505165611666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15846.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 505165611666 in words is "five hundred five billion, one hundred sixty-five million, six hundred eleven thousand, six hundred sixty-six".