166611516151556 has 48 divisors (see below), whose sum is σ = 340717172490240. Its totient is φ = 69816598993440.

The previous prime is 166611516151523. The next prime is 166611516151583. The reversal of 166611516151556 is 655151615116661.

It is a super-2 number, since 2×166611516151556² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 365411300 + ... + 365866971.

It is an arithmetic number, because the mean of its divisors is an integer number (7098274426880).

Almost surely, 2^{166611516151556} is an apocalyptic number.

It is an amenable number.

166611516151556 is an abundant number, since it is smaller than the sum of its proper divisors (174105656338684).

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

166611516151556 is a wasteful number, since it uses less digits than its factorization.

166611516151556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731278464 (or 731278462 counting only the distinct ones).

The product of its digits is 4860000, while the sum is 56.

The spelling of 166611516151556 in words is "one hundred sixty-six trillion, six hundred eleven billion, five hundred sixteen million, one hundred fifty-one thousand, five hundred fifty-six".