321666642 has 36 divisors (see below), whose sum is σ = 766068030. Its totient is φ = 97474080.

The previous prime is 321666629. The next prime is 321666649. The reversal of 321666642 is 246666123.

It can be written as a sum of positive squares in only one way, i.e., 321090561 + 576081 = 17919^2 + 759^2 .

It is a junction number, because it is equal to n+sod(n) for n = 321666597 and 321666606.

It is not an unprimeable number, because it can be changed into a prime (321666649) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 71667 + ... + 76022.

Almost surely, 2^321666642 is an apocalyptic number.

321666642 is an abundant number, since it is smaller than the sum of its proper divisors (444401388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321666642 is a wasteful number, since it uses less digits than its factorization.

321666642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147719 (or 147705 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 321666642 is about 17935.0673820870. The cubic root of 321666642 is about 685.1757887947.

The spelling of 321666642 in words is "three hundred twenty-one million, six hundred sixty-six thousand, six hundred forty-two".