656166394 has 32 divisors (see below), whose sum is σ = 1091316240. Its totient is φ = 294008832.

The previous prime is 656166373. The next prime is 656166409. The reversal of 656166394 is 493661656.

It can be written as a sum of positive squares in 8 ways, for example, as 481583025 + 174583369 = 21945^2 + 13213^2 .

It is a super-2 number, since 2×656166394² = 861108673229926472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131212 + ... + 136120.

Almost surely, 2^656166394 is an apocalyptic number.

656166394 is a deficient number, since it is larger than the sum of its proper divisors (435149846).

656166394 is a wasteful number, since it uses less digits than its factorization.

656166394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5074.

The product of its digits is 699840, while the sum is 46.

The square root of 656166394 is about 25615.7450408923. The cubic root of 656166394 is about 868.9697559485.

It can be divided in two parts, 65616 and 6394, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 656166394 in words is "six hundred fifty-six million, one hundred sixty-six thousand, three hundred ninety-four".