166665016556 has 6 divisors (see below), whose sum is σ = 291663778980. Its totient is φ = 83332508276.

The previous prime is 166665016549. The next prime is 166665016577. The reversal of 166665016556 is 655610566661.

It is a happy number.

It is a super-2 number, since 2×166665016556² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166665016498 and 166665016507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20833127066 + ... + 20833127073.

It is an arithmetic number, because the mean of its divisors is an integer number (48610629830).

Almost surely, 2^166665016556 is an apocalyptic number.

It is an amenable number.

166665016556 is a deficient number, since it is larger than the sum of its proper divisors (124998762424).

166665016556 is a wasteful number, since it uses less digits than its factorization.

166665016556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41666254143 (or 41666254141 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 166665016556 in words is "one hundred sixty-six billion, six hundred sixty-five million, sixteen thousand, five hundred fifty-six".