166622505 has 16 divisors (see below), whose sum is σ = 304681344. Its totient is φ = 76170240.

The previous prime is 166622471. The next prime is 166622509. The reversal of 166622505 is 505226661.

It is a happy number.

It is not a de Polignac number, because 166622505 - 2¹² = 166618409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166622509) 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, 793336 + ... + 793545.

It is an arithmetic number, because the mean of its divisors is an integer number (19042584).

Almost surely, 2^166622505 is an apocalyptic number.

166622505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166622505 is a deficient number, since it is larger than the sum of its proper divisors (138058839).

166622505 is a wasteful number, since it uses less digits than its factorization.

166622505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586896.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 166622505 is about 12908.2340000482. The cubic root of 166622505 is about 550.2725976519.

The spelling of 166622505 in words is "one hundred sixty-six million, six hundred twenty-two thousand, five hundred five".