66925801 has 4 divisors (see below), whose sum is σ = 66946900. Its totient is φ = 66904704.

The previous prime is 66925799. The next prime is 66925811. The reversal of 66925801 is 10852966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10852966 = 2 ⋅5426483.

It can be written as a sum of positive squares in 2 ways, for example, as 39677401 + 27248400 = 6299^2 + 5220^2 .

It is a cyclic number.

It is not a de Polignac number, because 66925801 - 2¹ = 66925799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66925811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4716 + ... + 12493.

It is an arithmetic number, because the mean of its divisors is an integer number (16736725).

Almost surely, 2^66925801 is an apocalyptic number.

It is an amenable number.

66925801 is a deficient number, since it is larger than the sum of its proper divisors (21099).

66925801 is a wasteful number, since it uses less digits than its factorization.

66925801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21098.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 66925801 is about 8180.8190910202. The cubic root of 66925801 is about 406.0048229183.

The spelling of 66925801 in words is "sixty-six million, nine hundred twenty-five thousand, eight hundred one".