661000326327 has 24 divisors (see below), whose sum is σ = 1044862050960. Its totient is φ = 399342497280.

The previous prime is 661000326319. The next prime is 661000326347. The reversal of 661000326327 is 723623000166.

661000326327 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 0 + 0 + 326 + 327 = 666.

It is not a de Polignac number, because 661000326327 - 2³ = 661000326319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661000326291 and 661000326300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661000326347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10499802 + ... + 10562567.

It is an arithmetic number, because the mean of its divisors is an integer number (43535918790).

Almost surely, 2^661000326327 is an apocalyptic number.

661000326327 is a deficient number, since it is larger than the sum of its proper divisors (383861724633).

661000326327 is a wasteful number, since it uses less digits than its factorization.

661000326327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21062703 (or 21062700 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The spelling of 661000326327 in words is "six hundred sixty-one billion, three hundred twenty-six thousand, three hundred twenty-seven".