661318655041 has 8 divisors (see below), whose sum is σ = 721474383168. Its totient is φ = 601168902000.

The previous prime is 661318655033. The next prime is 661318655083. The reversal of 661318655041 is 140556813166.

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 661318655041 - 2³ = 661318655033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661318654982 and 661318655000.

It is not an unprimeable number, because it can be changed into a prime (661318655141) 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, 1260765 + ... + 1706506.

It is an arithmetic number, because the mean of its divisors is an integer number (90184297896).

Almost surely, 2^661318655041 is an apocalyptic number.

It is an amenable number.

661318655041 is a deficient number, since it is larger than the sum of its proper divisors (60155728127).

661318655041 is a wasteful number, since it uses less digits than its factorization.

661318655041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987543.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 661318655041 in words is "six hundred sixty-one billion, three hundred eighteen million, six hundred fifty-five thousand, forty-one".