66167401 has 4 divisors (see below), whose sum is σ = 66184272. Its totient is φ = 66150532.

The previous prime is 66167369. The next prime is 66167429. The reversal of 66167401 is 10476166.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10476166 = 2 ⋅5238083.

It is a cyclic number.

It is not a de Polignac number, because 66167401 - 2⁵ = 66167369 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66167441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 870 + ... + 11536.

It is an arithmetic number, because the mean of its divisors is an integer number (16546068).

Almost surely, 2^66167401 is an apocalyptic number.

It is an amenable number.

66167401 is a deficient number, since it is larger than the sum of its proper divisors (16871).

66167401 is a wasteful number, since it uses less digits than its factorization.

66167401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16870.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 66167401 is about 8134.3346992855. The cubic root of 66167401 is about 404.4653841155.

The spelling of 66167401 in words is "sixty-six million, one hundred sixty-seven thousand, four hundred one".