66743257 has 8 divisors (see below), whose sum is σ = 80292800. Its totient is φ = 54197424.

The previous prime is 66743251. The next prime is 66743269. The reversal of 66743257 is 75234766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66743257 - 2⁷ = 66743129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66743251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250782 + ... + 251047.

It is an arithmetic number, because the mean of its divisors is an integer number (10036600).

Almost surely, 2^66743257 is an apocalyptic number.

It is an amenable number.

66743257 is a deficient number, since it is larger than the sum of its proper divisors (13549543).

66743257 is a wasteful number, since it uses less digits than its factorization.

66743257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501855.

The product of its digits is 211680, while the sum is 40.

The square root of 66743257 is about 8169.6546438635. The cubic root of 66743257 is about 405.6353529044.

It can be divided in two parts, 667432 and 57, that added together give a square (667489 = 817²).

The spelling of 66743257 in words is "sixty-six million, seven hundred forty-three thousand, two hundred fifty-seven".