66667445 has 8 divisors (see below), whose sum is σ = 86154936. Its totient is φ = 49231296.

The previous prime is 66667441. The next prime is 66667457. The reversal of 66667445 is 54476666.

It can be written as a sum of positive squares in 4 ways, for example, as 4289041 + 62378404 = 2071^2 + 7898^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66667445 - 2² = 66667441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66667396 and 66667405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66667441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512762 + ... + 512891.

It is an arithmetic number, because the mean of its divisors is an integer number (10769367).

Almost surely, 2^66667445 is an apocalyptic number.

66667445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66667445 is a deficient number, since it is larger than the sum of its proper divisors (19487491).

66667445 is a wasteful number, since it uses less digits than its factorization.

66667445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025671.

The product of its digits is 725760, while the sum is 44.

The square root of 66667445 is about 8165.0134721261. The cubic root of 66667445 is about 405.4817110256.

The spelling of 66667445 in words is "sixty-six million, six hundred sixty-seven thousand, four hundred forty-five".