66626541 has 6 divisors (see below), whose sum is σ = 96238350. Its totient is φ = 44417688.

The previous prime is 66626537. The next prime is 66626611. The reversal of 66626541 is 14562666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 36650916 + 29975625 = 6054^2 + 5475^2 .

It is not a de Polignac number, because 66626541 - 2² = 66626537 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66626496 and 66626505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66626531) 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 in 5 ways as a sum of consecutive naturals, for example, 3701466 + ... + 3701483.

It is an arithmetic number, because the mean of its divisors is an integer number (16039725).

Almost surely, 2^66626541 is an apocalyptic number.

It is an amenable number.

66626541 is a deficient number, since it is larger than the sum of its proper divisors (29611809).

66626541 is a wasteful number, since it uses less digits than its factorization.

66626541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7402955 (or 7402952 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66626541 is about 8162.5082542072. The cubic root of 66626541 is about 405.3987659082.

It can be divided in two parts, 6662 and 6541, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 66626541 in words is "sixty-six million, six hundred twenty-six thousand, five hundred forty-one".