162821661 has 16 divisors (see below), whose sum is σ = 218875584. Its totient is φ = 107662464.

The previous prime is 162821629. The next prime is 162821663. The reversal of 162821661 is 166128261.

It is not a de Polignac number, because 162821661 - 2⁵ = 162821629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162821663) 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, 297390 + ... + 297936.

It is an arithmetic number, because the mean of its divisors is an integer number (13679724).

Almost surely, 2^162821661 is an apocalyptic number.

It is an amenable number.

162821661 is a deficient number, since it is larger than the sum of its proper divisors (56053923).

162821661 is a wasteful number, since it uses less digits than its factorization.

162821661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180.

The product of its digits is 6912, while the sum is 33.

The square root of 162821661 is about 12760.1591291018. The cubic root of 162821661 is about 546.0562642444.

The spelling of 162821661 in words is "one hundred sixty-two million, eight hundred twenty-one thousand, six hundred sixty-one".