66910123 has 4 divisors (see below), whose sum is σ = 76468720. Its totient is φ = 57351528.

The previous prime is 66910117. The next prime is 66910133. The reversal of 66910123 is 32101966.

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

It is a cyclic number.

It is not a de Polignac number, because 66910123 - 2⁹ = 66909611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66910091 and 66910100.

It is not an unprimeable number, because it can be changed into a prime (66910133) 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, 4779288 + ... + 4779301.

It is an arithmetic number, because the mean of its divisors is an integer number (19117180).

Almost surely, 2^66910123 is an apocalyptic number.

66910123 is a deficient number, since it is larger than the sum of its proper divisors (9558597).

66910123 is an equidigital number, since it uses as much as digits as its factorization.

66910123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9558596.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 66910123 is about 8179.8608178868. The cubic root of 66910123 is about 405.9731169562.

It can be divided in two parts, 669101 and 23, that added together give a square (669124 = 818²).

The spelling of 66910123 in words is "sixty-six million, nine hundred ten thousand, one hundred twenty-three".