668085429 has 16 divisors (see below), whose sum is σ = 1022906880. Its totient is φ = 383589360.

The previous prime is 668085421. The next prime is 668085437. The reversal of 668085429 is 924580866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (668085421) and next prime (668085437).

It is not a de Polignac number, because 668085429 - 2³ = 668085421 is a prime.

It is a super-2 number, since 2×668085429² = 892676280884228082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668085421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532137 + ... + 533390.

It is an arithmetic number, because the mean of its divisors is an integer number (63931680).

Almost surely, 2^668085429 is an apocalyptic number.

It is an amenable number.

668085429 is a deficient number, since it is larger than the sum of its proper divisors (354821451).

668085429 is a wasteful number, since it uses less digits than its factorization.

668085429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065560.

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 668085429 is about 25847.3485874277. The cubic root of 668085429 is about 874.1997271800.

The spelling of 668085429 in words is "six hundred sixty-eight million, eighty-five thousand, four hundred twenty-nine".