66167801 has 4 divisors (see below), whose sum is σ = 75620352. Its totient is φ = 56715252.

The previous prime is 66167789. The next prime is 66167819. The reversal of 66167801 is 10876166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66167801 - 2¹⁴ = 66151417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66167501) 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, 4726265 + ... + 4726278.

It is an arithmetic number, because the mean of its divisors is an integer number (18905088).

Almost surely, 2^66167801 is an apocalyptic number.

It is an amenable number.

66167801 is a deficient number, since it is larger than the sum of its proper divisors (9452551).

66167801 is an equidigital number, since it uses as much as digits as its factorization.

66167801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9452550.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 66167801 is about 8134.3592863851. The cubic root of 66167801 is about 404.4661991484.

The spelling of 66167801 in words is "sixty-six million, one hundred sixty-seven thousand, eight hundred one".