661701966 has 16 divisors (see below), whose sum is σ = 1342044288. Its totient is φ = 217460600.

The previous prime is 661701959. The next prime is 661701977. The reversal of 661701966 is 669107166.

661701966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 776220 + ... + 777071.

It is an arithmetic number, because the mean of its divisors is an integer number (83877768).

Almost surely, 2^661701966 is an apocalyptic number.

661701966 is an abundant number, since it is smaller than the sum of its proper divisors (680342322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661701966 is a wasteful number, since it uses less digits than its factorization.

661701966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553367.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 661701966 is about 25723.5682983524. The cubic root of 661701966 is about 871.4065265382.

The spelling of 661701966 in words is "six hundred sixty-one million, seven hundred one thousand, nine hundred sixty-six".