66858436 has 6 divisors (see below), whose sum is σ = 117002270. Its totient is φ = 33429216.

The previous prime is 66858431. The next prime is 66858439. The reversal of 66858436 is 63485866.

It can be written as a sum of positive squares in only one way, i.e., 65512836 + 1345600 = 8094^2 + 1160^2 .

It is not an unprimeable number, because it can be changed into a prime (66858431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8357301 + ... + 8357308.

Almost surely, 2^66858436 is an apocalyptic number.

It is an amenable number.

66858436 is a deficient number, since it is larger than the sum of its proper divisors (50143834).

66858436 is a wasteful number, since it uses less digits than its factorization.

66858436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16714613 (or 16714611 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 66858436 is about 8176.7008016681. The cubic root of 66858436 is about 405.8685541137.

The spelling of 66858436 in words is "sixty-six million, eight hundred fifty-eight thousand, four hundred thirty-six".