66707401 has 4 divisors (see below), whose sum is σ = 66724804. Its totient is φ = 66690000.

The previous prime is 66707359. The next prime is 66707413. The reversal of 66707401 is 10470766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10470766 = 2 ⋅5235383.

It can be written as a sum of positive squares in 2 ways, for example, as 54464400 + 12243001 = 7380^2 + 3499^2 .

It is a cyclic number.

It is not a de Polignac number, because 66707401 - 2¹³ = 66699209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66707441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150 + ... + 11551.

It is an arithmetic number, because the mean of its divisors is an integer number (16681201).

Almost surely, 2^66707401 is an apocalyptic number.

It is an amenable number.

66707401 is a deficient number, since it is larger than the sum of its proper divisors (17403).

66707401 is a wasteful number, since it uses less digits than its factorization.

66707401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17402.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 66707401 is about 8167.4598866477. The cubic root of 66707401 is about 405.5627010382.

The spelling of 66707401 in words is "sixty-six million, seven hundred seven thousand, four hundred one".