66749803 has 16 divisors (see below), whose sum is σ = 72990720. Its totient is φ = 60794496.

The previous prime is 66749783. The next prime is 66749807. The reversal of 66749803 is 30894766.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66749803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66749803.

It is not an unprimeable number, because it can be changed into a prime (66749807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92478 + ... + 93196.

It is an arithmetic number, because the mean of its divisors is an integer number (4561920).

Almost surely, 2^66749803 is an apocalyptic number.

66749803 is a deficient number, since it is larger than the sum of its proper divisors (6240917).

66749803 is a wasteful number, since it uses less digits than its factorization.

66749803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 66749803 is about 8170.0552629710. The cubic root of 66749803 is about 405.6486136808.

The spelling of 66749803 in words is "sixty-six million, seven hundred forty-nine thousand, eight hundred three".