661689166322 has 8 divisors (see below), whose sum is σ = 992567908272. Its totient is φ = 330833196900.

The previous prime is 661689166279. The next prime is 661689166331. The reversal of 661689166322 is 223661986166.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5620304 + ... + 5736827.

It is an arithmetic number, because the mean of its divisors is an integer number (124070988534).

Almost surely, 2^661689166322 is an apocalyptic number.

661689166322 is a deficient number, since it is larger than the sum of its proper divisors (330878741950).

661689166322 is a wasteful number, since it uses less digits than its factorization.

661689166322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11386264.

The product of its digits is 6718464, while the sum is 56.

The spelling of 661689166322 in words is "six hundred sixty-one billion, six hundred eighty-nine million, one hundred sixty-six thousand, three hundred twenty-two".