66750635 has 12 divisors (see below), whose sum is σ = 91610064. Its totient is φ = 45738720.

The previous prime is 66750613. The next prime is 66750637. The reversal of 66750635 is 53605766.

It is not a de Polignac number, because 66750635 - 2¹⁸ = 66488491 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66750637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47645 + ... + 49025.

It is an arithmetic number, because the mean of its divisors is an integer number (7634172).

Almost surely, 2^66750635 is an apocalyptic number.

66750635 is a deficient number, since it is larger than the sum of its proper divisors (24859429).

66750635 is an frugal number, since it uses more digits than its factorization.

66750635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774 (or 1393 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 38.

The square root of 66750635 is about 8170.1061804606. The cubic root of 66750635 is about 405.6502990703.

The spelling of 66750635 in words is "sixty-six million, seven hundred fifty thousand, six hundred thirty-five".