66247138 has 8 divisors (see below), whose sum is σ = 101245788. Its totient is φ = 32498544.

The previous prime is 66247081. The next prime is 66247141. The reversal of 66247138 is 83174266.

It can be written as a sum of positive squares in 2 ways, for example, as 64432729 + 1814409 = 8027^2 + 1347^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 66247097 and 66247106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312381 + ... + 312592.

Almost surely, 2^66247138 is an apocalyptic number.

66247138 is a deficient number, since it is larger than the sum of its proper divisors (34998650).

66247138 is a wasteful number, since it uses less digits than its factorization.

66247138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625028.

The product of its digits is 48384, while the sum is 37.

The square root of 66247138 is about 8139.2344848886. The cubic root of 66247138 is about 404.6277899203.

The spelling of 66247138 in words is "sixty-six million, two hundred forty-seven thousand, one hundred thirty-eight".