66457243 has 4 divisors (see below), whose sum is σ = 67546768. Its totient is φ = 65367720.

The previous prime is 66457163. The next prime is 66457277. The reversal of 66457243 is 34275466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34275466 = 2 ⋅17137733.

It is a cyclic number.

It is not a de Polignac number, because 66457243 - 2¹⁷ = 66326171 is a prime.

It is a super-2 number, since 2×66457243² = 8833130294322098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66457543) 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, 544671 + ... + 544792.

It is an arithmetic number, because the mean of its divisors is an integer number (16886692).

Almost surely, 2^66457243 is an apocalyptic number.

66457243 is a deficient number, since it is larger than the sum of its proper divisors (1089525).

66457243 is a wasteful number, since it uses less digits than its factorization.

66457243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089524.

The product of its digits is 120960, while the sum is 37.

The square root of 66457243 is about 8152.1311937431. The cubic root of 66457243 is about 405.0551019881.

The spelling of 66457243 in words is "sixty-six million, four hundred fifty-seven thousand, two hundred forty-three".