166405254164 has 6 divisors (see below), whose sum is σ = 291209194794. Its totient is φ = 83202627080.

The previous prime is 166405254151. The next prime is 166405254193. The reversal of 166405254164 is 461452504661.

It can be written as a sum of positive squares in only one way, i.e., 130688034064 + 35717220100 = 361508^2 + 188990^2 .

It is a super-2 number, since 2×166405254164² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20800656767 + ... + 20800656774.

It is an arithmetic number, because the mean of its divisors is an integer number (48534865799).

Almost surely, 2^166405254164 is an apocalyptic number.

It is an amenable number.

166405254164 is a deficient number, since it is larger than the sum of its proper divisors (124803940630).

166405254164 is a wasteful number, since it uses less digits than its factorization.

166405254164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41601313545 (or 41601313543 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 166405254164 in words is "one hundred sixty-six billion, four hundred five million, two hundred fifty-four thousand, one hundred sixty-four".