66435947 has 4 divisors (see below), whose sum is σ = 67562040. Its totient is φ = 65309856.

The previous prime is 66435931. The next prime is 66435953. The reversal of 66435947 is 74953466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66435947 - 2⁴ = 66435931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66435898 and 66435907.

It is not an unprimeable number, because it can be changed into a prime (66437947) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 562958 + ... + 563075.

It is an arithmetic number, because the mean of its divisors is an integer number (16890510).

Almost surely, 2^66435947 is an apocalyptic number.

66435947 is a deficient number, since it is larger than the sum of its proper divisors (1126093).

66435947 is a wasteful number, since it uses less digits than its factorization.

66435947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126092.

The product of its digits is 544320, while the sum is 44.

The square root of 66435947 is about 8150.8249275763. The cubic root of 66435947 is about 405.0118311841.

The spelling of 66435947 in words is "sixty-six million, four hundred thirty-five thousand, nine hundred forty-seven".