666631434 has 32 divisors (see below), whose sum is σ = 1525804416. Its totient is φ = 190206720.

The previous prime is 666631393. The next prime is 666631463. The reversal of 666631434 is 434136666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666631392 and 666631401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21534 + ... + 42390.

It is an arithmetic number, because the mean of its divisors is an integer number (47681388).

Almost surely, 2^666631434 is an apocalyptic number.

666631434 is an abundant number, since it is smaller than the sum of its proper divisors (859172982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666631434 is a wasteful number, since it uses less digits than its factorization.

666631434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21630.

The product of its digits is 186624, while the sum is 39.

The square root of 666631434 is about 25819.2066880452. The cubic root of 666631434 is about 873.5650751805.

The spelling of 666631434 in words is "six hundred sixty-six million, six hundred thirty-one thousand, four hundred thirty-four".