661385222 has 16 divisors (see below), whose sum is σ = 1018809792. Its totient is φ = 321860160.

The previous prime is 661385209. The next prime is 661385233. The reversal of 661385222 is 222583166.

661385222 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, 2423 + ... + 36450.

It is an arithmetic number, because the mean of its divisors is an integer number (63675612).

Almost surely, 2^661385222 is an apocalyptic number.

661385222 is a deficient number, since it is larger than the sum of its proper divisors (357424570).

661385222 is a wasteful number, since it uses less digits than its factorization.

661385222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39103.

The product of its digits is 34560, while the sum is 35.

The square root of 661385222 is about 25717.4108727920. The cubic root of 661385222 is about 871.2674625006.

The spelling of 661385222 in words is "six hundred sixty-one million, three hundred eighty-five thousand, two hundred twenty-two".