66570457 has 4 divisors (see below), whose sum is σ = 68866020. Its totient is φ = 64274896.

The previous prime is 66570443. The next prime is 66570473. The reversal of 66570457 is 75407566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49505296 + 17065161 = 7036^2 + 4131^2 .

It is a cyclic number.

It is not a de Polignac number, because 66570457 - 2¹¹ = 66568409 is a prime.

It is a super-3 number, since 3×66570457³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) 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 (66570557) 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, 1147738 + ... + 1147795.

It is an arithmetic number, because the mean of its divisors is an integer number (17216505).

Almost surely, 2^66570457 is an apocalyptic number.

It is an amenable number.

66570457 is a deficient number, since it is larger than the sum of its proper divisors (2295563).

66570457 is a wasteful number, since it uses less digits than its factorization.

66570457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295562.

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 66570457 is about 8159.0720673371. The cubic root of 66570457 is about 405.2849835896.

The spelling of 66570457 in words is "sixty-six million, five hundred seventy thousand, four hundred fifty-seven".