66533005 has 32 divisors (see below), whose sum is σ = 101207808. Its totient is φ = 40780800.

The previous prime is 66532957. The next prime is 66533009. The reversal of 66533005 is 50033566.

It is not a de Polignac number, because 66533005 - 2²¹ = 64435853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66533009) 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 31 ways as a sum of consecutive naturals, for example, 22069 + ... + 24901.

It is an arithmetic number, because the mean of its divisors is an integer number (3162744).

Almost surely, 2^66533005 is an apocalyptic number.

It is an amenable number.

66533005 is a deficient number, since it is larger than the sum of its proper divisors (34674803).

66533005 is a wasteful number, since it uses less digits than its factorization.

66533005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917.

The product of its (nonzero) digits is 8100, while the sum is 28.

The square root of 66533005 is about 8156.7766305079. The cubic root of 66533005 is about 405.2089659823.

It can be divided in two parts, 665 and 33005, that added together give a triangular number (33670 = T₂₅₉).

The spelling of 66533005 in words is "sixty-six million, five hundred thirty-three thousand, five".