166666658518515 has 32 divisors (see below), whose sum is σ = 267938199000576. Its totient is φ = 88465060373760.

The previous prime is 166666658518513. The next prime is 166666658518537. The reversal of 166666658518515 is 515815856666661.

It is not a de Polignac number, because 166666658518515 - 2¹ = 166666658518513 is a prime.

It is a super-2 number, since 2×166666658518515² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166666658518513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111701839 + ... + 113184071.

It is an arithmetic number, because the mean of its divisors is an integer number (8373068718768).

Almost surely, 2^{166666658518515} is an apocalyptic number.

166666658518515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166666658518515 is a deficient number, since it is larger than the sum of its proper divisors (101271540482061).

166666658518515 is a wasteful number, since it uses less digits than its factorization.

166666658518515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517979.

The product of its digits is 1866240000, while the sum is 75.

The spelling of 166666658518515 in words is "one hundred sixty-six trillion, six hundred sixty-six billion, six hundred fifty-eight million, five hundred eighteen thousand, five hundred fifteen".