66402347 has 4 divisors (see below), whose sum is σ = 72438936. Its totient is φ = 60365760.

The previous prime is 66402337. The next prime is 66402353. The reversal of 66402347 is 74320466.

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 66402347 - 2¹⁰ = 66401323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66402337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3018278 + ... + 3018299.

It is an arithmetic number, because the mean of its divisors is an integer number (18109734).

Almost surely, 2^66402347 is an apocalyptic number.

66402347 is a deficient number, since it is larger than the sum of its proper divisors (6036589).

66402347 is a wasteful number, since it uses less digits than its factorization.

66402347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6036588.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 66402347 is about 8148.7635258363. The cubic root of 66402347 is about 404.9435413855.

The spelling of 66402347 in words is "sixty-six million, four hundred two thousand, three hundred forty-seven".