166291503858123 has 32 divisors (see below), whose sum is σ = 259647199472640. Its totient is φ = 92680987069440.

The previous prime is 166291503858113. The next prime is 166291503858127. The reversal of 166291503858123 is 321858305192661.

It is a de Polignac number, because none of the positive numbers 2^k-166291503858123 is a prime.

It is a super-2 number, since 2×166291503858123² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166291503858127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22937743 + ... + 29303976.

It is an arithmetic number, because the mean of its divisors is an integer number (8113974983520).

Almost surely, 2^{166291503858123} is an apocalyptic number.

166291503858123 is a deficient number, since it is larger than the sum of its proper divisors (93355695614517).

166291503858123 is a wasteful number, since it uses less digits than its factorization.

166291503858123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52245467.

The product of its (nonzero) digits is 18662400, while the sum is 60.

The spelling of 166291503858123 in words is "one hundred sixty-six trillion, two hundred ninety-one billion, five hundred three million, eight hundred fifty-eight thousand, one hundred twenty-three".