1668261429 has 12 divisors (see below), whose sum is σ = 2412112300. Its totient is φ = 1111065984.

The previous prime is 1668261421. The next prime is 1668261437. The reversal of 1668261429 is 9241628661.

1668261429 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 2 + 614 + 29 = 666.

It is an interprime number because it is at equal distance from previous prime (1668261421) and next prime (1668261437).

It can be written as a sum of positive squares in 2 ways, for example, as 1028677329 + 639584100 = 32073^2 + 25290^2 .

It is not a de Polignac number, because 1668261429 - 2³ = 1668261421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668261421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82774 + ... + 100935.

Almost surely, 2^1668261429 is an apocalyptic number.

It is an amenable number.

1668261429 is a deficient number, since it is larger than the sum of its proper divisors (743850871).

1668261429 is a wasteful number, since it uses less digits than its factorization.

1668261429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184724 (or 184721 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 1668261429 is about 40844.3561462291. The cubic root of 1668261429 is about 1186.0091409101.

The spelling of 1668261429 in words is "one billion, six hundred sixty-eight million, two hundred sixty-one thousand, four hundred twenty-nine".