66544359 has 32 divisors (see below), whose sum is σ = 106389504. Its totient is φ = 36173280.

The previous prime is 66544301. The next prime is 66544363. The reversal of 66544359 is 95344566.

It is not a de Polignac number, because 66544359 - 2¹² = 66540263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66544359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66544459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149992 + ... + 150434.

It is an arithmetic number, because the mean of its divisors is an integer number (3324672).

Almost surely, 2^66544359 is an apocalyptic number.

66544359 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

66544359 is a deficient number, since it is larger than the sum of its proper divisors (39845145).

66544359 is a wasteful number, since it uses less digits than its factorization.

66544359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787.

The product of its digits is 388800, while the sum is 42.

The square root of 66544359 is about 8157.4725865307. The cubic root of 66544359 is about 405.2320145976.

The spelling of 66544359 in words is "sixty-six million, five hundred forty-four thousand, three hundred fifty-nine".