151666 has 4 divisors (see below), whose sum is σ = 227502. Its totient is φ = 75832.

The previous prime is 151651. The next prime is 151667. The reversal of 151666 is 666151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666151 = 157 ⋅4243.

It can be written as a sum of positive squares in only one way, i.e., 99225 + 52441 = 315^2 + 229^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 151666.

It is not an unprimeable number, because it can be changed into a prime (151667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37915 + ... + 37918.

2¹⁵¹⁶⁶⁶ is an apocalyptic number.

151666 is a deficient number, since it is larger than the sum of its proper divisors (75836).

151666 is an equidigital number, since it uses as much as digits as its factorization.

151666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75835.

The product of its digits is 1080, while the sum is 25.

The square root of 151666 is about 389.4431922630. The cubic root of 151666 is about 53.3289145645.

It can be divided in two parts, 15 and 1666, that added together give a square (1681 = 41²).

The spelling of 151666 in words is "one hundred fifty-one thousand, six hundred sixty-six".