161564266166 has 32 divisors (see below), whose sum is σ = 251452080000. Its totient is φ = 77811518592.

The previous prime is 161564266117. The next prime is 161564266169. The reversal of 161564266166 is 661662465161.

It is a super-2 number, since 2×161564266166² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161564266169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1473740 + ... + 1579568.

It is an arithmetic number, because the mean of its divisors is an integer number (7857877500).

Almost surely, 2^161564266166 is an apocalyptic number.

161564266166 is a deficient number, since it is larger than the sum of its proper divisors (89887813834).

161564266166 is a wasteful number, since it uses less digits than its factorization.

161564266166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106136.

The product of its digits is 1866240, while the sum is 50.

The spelling of 161564266166 in words is "one hundred sixty-one billion, five hundred sixty-four million, two hundred sixty-six thousand, one hundred sixty-six".