661168466 has 24 divisors (see below), whose sum is σ = 1184858316. Its totient is φ = 275698080.

The previous prime is 661168423. The next prime is 661168493. The reversal of 661168466 is 664861166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 658179025 + 2989441 = 25655^2 + 1729^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87545 + ... + 94796.

Almost surely, 2^661168466 is an apocalyptic number.

661168466 is a deficient number, since it is larger than the sum of its proper divisors (523689850).

661168466 is a wasteful number, since it uses less digits than its factorization.

661168466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182394 (or 182387 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 661168466 is about 25713.1963396230. The cubic root of 661168466 is about 871.1722718420.

The spelling of 661168466 in words is "six hundred sixty-one million, one hundred sixty-eight thousand, four hundred sixty-six".