515115661666 has 32 divisors (see below), whose sum is σ = 841427637120. Its totient is φ = 235693872000.

The previous prime is 515115661649. The next prime is 515115661673. The reversal of 515115661666 is 666166511515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1479406 + ... + 1794121.

It is an arithmetic number, because the mean of its divisors is an integer number (26294613660).

Almost surely, 2^515115661666 is an apocalyptic number.

515115661666 is a deficient number, since it is larger than the sum of its proper divisors (326311975454).

515115661666 is a wasteful number, since it uses less digits than its factorization.

515115661666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273690.

The product of its digits is 972000, while the sum is 49.

The spelling of 515115661666 in words is "five hundred fifteen billion, one hundred fifteen million, six hundred sixty-one thousand, six hundred sixty-six".