661322041 has 8 divisors (see below), whose sum is σ = 670528544. Its totient is φ = 652164480.

The previous prime is 661322033. The next prime is 661322063. The reversal of 661322041 is 140223166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661322041 - 2³ = 661322033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661321997 and 661322015.

It is not an unprimeable number, because it can be changed into a prime (661322071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15406 + ... + 39496.

It is an arithmetic number, because the mean of its divisors is an integer number (83816068).

Almost surely, 2^661322041 is an apocalyptic number.

It is an amenable number.

661322041 is a deficient number, since it is larger than the sum of its proper divisors (9206503).

661322041 is a wasteful number, since it uses less digits than its factorization.

661322041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24471.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 661322041 is about 25716.1824732988. The cubic root of 661322041 is about 871.2397180532.

The spelling of 661322041 in words is "six hundred sixty-one million, three hundred twenty-two thousand, forty-one".