66169957 has 4 divisors (see below), whose sum is σ = 75622816. Its totient is φ = 56717100.

The previous prime is 66169931. The next prime is 66169969. The reversal of 66169957 is 75996166.

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: 75996166 = 2 ⋅37998083.

It is a cyclic number.

It is not a de Polignac number, because 66169957 - 2¹¹ = 66167909 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 66169957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66169997) 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, 4726419 + ... + 4726432.

It is an arithmetic number, because the mean of its divisors is an integer number (18905704).

Almost surely, 2^66169957 is an apocalyptic number.

It is an amenable number.

66169957 is a deficient number, since it is larger than the sum of its proper divisors (9452859).

66169957 is an equidigital number, since it uses as much as digits as its factorization.

66169957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9452858.

The product of its digits is 612360, while the sum is 49.

The square root of 66169957 is about 8134.4918095724. The cubic root of 66169957 is about 404.4705921192.

The spelling of 66169957 in words is "sixty-six million, one hundred sixty-nine thousand, nine hundred fifty-seven".