66431626 has 8 divisors (see below), whose sum is σ = 99844740. Its totient is φ = 33150048.

The previous prime is 66431611. The next prime is 66431669. The reversal of 66431626 is 62613466.

It can be written as a sum of positive squares in 2 ways, for example, as 66341025 + 90601 = 8145^2 + 301^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 66431591 and 66431600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31611 + ... + 33646.

Almost surely, 2^66431626 is an apocalyptic number.

66431626 is a deficient number, since it is larger than the sum of its proper divisors (33413114).

66431626 is a wasteful number, since it uses less digits than its factorization.

66431626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65768.

The product of its digits is 31104, while the sum is 34.

The square root of 66431626 is about 8150.5598580711. The cubic root of 66431626 is about 405.0030503250.

The spelling of 66431626 in words is "sixty-six million, four hundred thirty-one thousand, six hundred twenty-six".