166611155997 has 16 divisors (see below), whose sum is σ = 260985307968. Its totient is φ = 93209038080.

The previous prime is 166611155993. The next prime is 166611156037. The reversal of 166611155997 is 799551116661.

It is not a de Polignac number, because 166611155997 - 2² = 166611155993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166611155993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194185068 + ... + 194185925.

It is an arithmetic number, because the mean of its divisors is an integer number (16311581748).

Almost surely, 2^166611155997 is an apocalyptic number.

It is an amenable number.

166611155997 is a deficient number, since it is larger than the sum of its proper divisors (94374151971).

166611155997 is a wasteful number, since it uses less digits than its factorization.

166611155997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388371020.

The product of its digits is 3061800, while the sum is 57.

The spelling of 166611155997 in words is "one hundred sixty-six billion, six hundred eleven million, one hundred fifty-five thousand, nine hundred ninety-seven".