64540123 has 2 divisors, whose sum is σ = 64540124. Its totient is φ = 64540122.

The previous prime is 64540087. The next prime is 64540129. The reversal of 64540123 is 32104546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64540123 - 2²¹ = 62442971 is a prime.

It is not a weakly prime, because it can be changed into another prime (64540129) 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 as a sum of consecutive naturals, namely, 32270061 + 32270062.

It is an arithmetic number, because the mean of its divisors is an integer number (32270062).

Almost surely, 2^64540123 is an apocalyptic number.

64540123 is a deficient number, since it is larger than the sum of its proper divisors (1).

64540123 is an equidigital number, since it uses as much as digits as its factorization.

64540123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 64540123 is about 8033.6867626265. The cubic root of 64540123 is about 401.1221055046.

Adding to 64540123 its reverse (32104546), we get a palindrome (96644669).

The spelling of 64540123 in words is "sixty-four million, five hundred forty thousand, one hundred twenty-three".