661960896005 has 8 divisors (see below), whose sum is σ = 794463338112. Its totient is φ = 529495208208.

The previous prime is 661960895993. The next prime is 661960896061. The reversal of 661960896005 is 500698069166.

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 661960896005 - 2⁴ = 661960895989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9148937 + ... + 9221006.

It is an arithmetic number, because the mean of its divisors is an integer number (99307917264).

Almost surely, 2^661960896005 is an apocalyptic number.

It is an amenable number.

661960896005 is a deficient number, since it is larger than the sum of its proper divisors (132502442107).

661960896005 is a wasteful number, since it uses less digits than its factorization.

661960896005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18377155.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 661960896005 in words is "six hundred sixty-one billion, nine hundred sixty million, eight hundred ninety-six thousand, five".