164266661 has 4 divisors (see below), whose sum is σ = 176902572. Its totient is φ = 151630752.

The previous prime is 164266657. The next prime is 164266681. The reversal of 164266661 is 166662461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166662461 = 7 ⋅23808923.

It can be written as a sum of positive squares in 2 ways, for example, as 26204161 + 138062500 = 5119^2 + 11750^2 .

It is not a de Polignac number, because 164266661 - 2² = 164266657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164266601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6317936 + ... + 6317961.

It is an arithmetic number, because the mean of its divisors is an integer number (44225643).

Almost surely, 2^164266661 is an apocalyptic number.

It is an amenable number.

164266661 is a deficient number, since it is larger than the sum of its proper divisors (12635911).

164266661 is a wasteful number, since it uses less digits than its factorization.

164266661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12635910.

The product of its digits is 62208, while the sum is 38.

The square root of 164266661 is about 12816.6556090113. The cubic root of 164266661 is about 547.6668782324. Note that the first 3 decimals are identical.

The spelling of 164266661 in words is "one hundred sixty-four million, two hundred sixty-six thousand, six hundred sixty-one".