66700393 has 4 divisors (see below), whose sum is σ = 70210960. Its totient is φ = 63189828.

The previous prime is 66700373. The next prime is 66700421. The reversal of 66700393 is 39300766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39300766 = 2 ⋅19650383.

It is a cyclic number.

It is not a de Polignac number, because 66700393 - 2²¹ = 64603241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66700303) 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, 1755255 + ... + 1755292.

It is an arithmetic number, because the mean of its divisors is an integer number (17552740).

Almost surely, 2^66700393 is an apocalyptic number.

It is an amenable number.

66700393 is a deficient number, since it is larger than the sum of its proper divisors (3510567).

66700393 is a wasteful number, since it uses less digits than its factorization.

66700393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510566.

The product of its (nonzero) digits is 20412, while the sum is 34.

The square root of 66700393 is about 8167.0308558251. The cubic root of 66700393 is about 405.5484983016.

The spelling of 66700393 in words is "sixty-six million, seven hundred thousand, three hundred ninety-three".