66898441 has 4 divisors (see below), whose sum is σ = 67814932. Its totient is φ = 65981952.

The previous prime is 66898409. The next prime is 66898453. The reversal of 66898441 is 14489866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50055625 + 16842816 = 7075^2 + 4104^2 .

It is a cyclic number.

It is not a de Polignac number, because 66898441 - 2⁵ = 66898409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66898391 and 66898400.

It is not an unprimeable number, because it can be changed into a prime (66898471) 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, 458136 + ... + 458281.

It is an arithmetic number, because the mean of its divisors is an integer number (16953733).

Almost surely, 2^66898441 is an apocalyptic number.

It is an amenable number.

66898441 is a deficient number, since it is larger than the sum of its proper divisors (916491).

66898441 is an equidigital number, since it uses as much as digits as its factorization.

66898441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916490.

The product of its digits is 331776, while the sum is 46.

The square root of 66898441 is about 8179.1467158867. The cubic root of 66898441 is about 405.9494889720.

The spelling of 66898441 in words is "sixty-six million, eight hundred ninety-eight thousand, four hundred forty-one".