66155505 has 32 divisors (see below), whose sum is σ = 115153920. Its totient is φ = 32236800.

The previous prime is 66155497. The next prime is 66155513. The reversal of 66155505 is 50555166.

It is an interprime number because it is at equal distance from previous prime (66155497) and next prime (66155513).

It is not a de Polignac number, because 66155505 - 2³ = 66155497 is a prime.

It is an unprimeable number.

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, 18016 + ... + 21374.

It is an arithmetic number, because the mean of its divisors is an integer number (3598560).

Almost surely, 2^66155505 is an apocalyptic number.

66155505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66155505 is a deficient number, since it is larger than the sum of its proper divisors (48998415).

66155505 is a wasteful number, since it uses less digits than its factorization.

66155505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 66155505 is about 8133.6034449683. The cubic root of 66155505 is about 404.4411435352.

The spelling of 66155505 in words is "sixty-six million, one hundred fifty-five thousand, five hundred five".