321660420609 has 16 divisors (see below), whose sum is σ = 467919454464. Its totient is φ = 194924979600.

The previous prime is 321660420593. The next prime is 321660420623. The reversal of 321660420609 is 906024066123.

It is not a de Polignac number, because 321660420609 - 2⁴ = 321660420593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321660420509) 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, 200299 + ... + 826704.

It is an arithmetic number, because the mean of its divisors is an integer number (29244965904).

Almost surely, 2^321660420609 is an apocalyptic number.

It is an amenable number.

321660420609 is a deficient number, since it is larger than the sum of its proper divisors (146259033855).

321660420609 is a wasteful number, since it uses less digits than its factorization.

321660420609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036508.

The product of its (nonzero) digits is 93312, while the sum is 39.

The spelling of 321660420609 in words is "three hundred twenty-one billion, six hundred sixty million, four hundred twenty thousand, six hundred nine".