66551524505 has 8 divisors (see below), whose sum is σ = 80594507400. Its totient is φ = 52752767616.

The previous prime is 66551524499. The next prime is 66551524531. The reversal of 66551524505 is 50542515566.

It can be written as a sum of positive squares in 4 ways, for example, as 20348451904 + 46203072601 = 142648^2 + 214949^2 .

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 66551524505 - 2⁶ = 66551524441 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61055900 + ... + 61056989.

It is an arithmetic number, because the mean of its divisors is an integer number (10074313425).

Almost surely, 2^66551524505 is an apocalyptic number.

It is an amenable number.

66551524505 is a deficient number, since it is larger than the sum of its proper divisors (14042982895).

66551524505 is a wasteful number, since it uses less digits than its factorization.

66551524505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122113003.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 66551524505 in words is "sixty-six billion, five hundred fifty-one million, five hundred twenty-four thousand, five hundred five".