66957123 has 8 divisors (see below), whose sum is σ = 89358336. Its totient is φ = 44597000.

The previous prime is 66957109. The next prime is 66957127. The reversal of 66957123 is 32175966.

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

It is a cyclic number.

It is not a de Polignac number, because 66957123 - 2⁸ = 66956867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66957127) 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, 6243 + ... + 13148.

It is an arithmetic number, because the mean of its divisors is an integer number (11169792).

Almost surely, 2^66957123 is an apocalyptic number.

66957123 is a deficient number, since it is larger than the sum of its proper divisors (22401213).

66957123 is a wasteful number, since it uses less digits than its factorization.

66957123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20545.

The product of its digits is 68040, while the sum is 39.

The square root of 66957123 is about 8182.7332230741. The cubic root of 66957123 is about 406.0681512586.

It can be divided in two parts, 66957 and 123, that multiplied together give a triangular number (8235711 = T₄₀₅₈).

The spelling of 66957123 in words is "sixty-six million, nine hundred fifty-seven thousand, one hundred twenty-three".