662661321 has 16 divisors (see below), whose sum is σ = 1015062528. Its totient is φ = 376678800.

The previous prime is 662661299. The next prime is 662661323. The reversal of 662661321 is 123166266.

It is not a de Polignac number, because 662661321 - 2¹³ = 662653129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (662661323) 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, 78595 + ... + 86616.

It is an arithmetic number, because the mean of its divisors is an integer number (63441408).

Almost surely, 2^662661321 is an apocalyptic number.

It is an amenable number.

662661321 is a deficient number, since it is larger than the sum of its proper divisors (352401207).

662661321 is a wasteful number, since it uses less digits than its factorization.

662661321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165412.

The product of its digits is 15552, while the sum is 33.

The square root of 662661321 is about 25742.2089378515. The cubic root of 662661321 is about 871.8274534625.

The spelling of 662661321 in words is "six hundred sixty-two million, six hundred sixty-one thousand, three hundred twenty-one".