66254401 has 8 divisors (see below), whose sum is σ = 68003208. Its totient is φ = 64512000.

The previous prime is 66254341. The next prime is 66254407. The reversal of 66254401 is 10445266.

It can be written as a sum of positive squares in 4 ways, for example, as 76176 + 66178225 = 276^2 + 8135^2 .

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 66254401 - 2²³ = 57865793 is a prime.

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 66254401.

It is not an unprimeable number, because it can be changed into a prime (66254407) 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, 25021 + ... + 27541.

It is an arithmetic number, because the mean of its divisors is an integer number (8500401).

Almost surely, 2^66254401 is an apocalyptic number.

It is an amenable number.

66254401 is a deficient number, since it is larger than the sum of its proper divisors (1748807).

66254401 is a wasteful number, since it uses less digits than its factorization.

66254401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 66254401 is about 8139.6806448410. The cubic root of 66254401 is about 404.6425764924.

Adding to 66254401 its reverse (10445266), we get a palindrome (76699667).

It can be divided in two parts, 6625 and 4401, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 66254401 in words is "sixty-six million, two hundred fifty-four thousand, four hundred one".