166405160001231 has 6 divisors (see below), whose sum is σ = 240363008890680. Its totient is φ = 110936773334148.

The previous prime is 166405160001229. The next prime is 166405160001253. The reversal of 166405160001231 is 132100061504661.

166405160001231 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 0 + 5 + 1 + 600 + 0 + 12 + 31 = 666.

It is not a de Polignac number, because 166405160001231 - 2¹ = 166405160001229 is a prime.

It is a super-2 number, since 2×166405160001231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166405160001221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9244731111171 + ... + 9244731111188.

It is an arithmetic number, because the mean of its divisors is an integer number (40060501481780).

Almost surely, 2^{166405160001231} is an apocalyptic number.

166405160001231 is a deficient number, since it is larger than the sum of its proper divisors (73957848889449).

166405160001231 is a wasteful number, since it uses less digits than its factorization.

166405160001231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18489462222365 (or 18489462222362 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 166405160001231 in words is "one hundred sixty-six trillion, four hundred five billion, one hundred sixty million, one thousand, two hundred thirty-one".