66555013 has 16 divisors (see below), whose sum is σ = 79744896. Its totient is φ = 54351360.

The previous prime is 66554987. The next prime is 66555023. The reversal of 66555013 is 31055566.

It is not a de Polignac number, because 66555013 - 2⁵ = 66554981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66555023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9645 + ... + 15037.

It is an arithmetic number, because the mean of its divisors is an integer number (4984056).

Almost surely, 2^66555013 is an apocalyptic number.

It is an amenable number.

66555013 is a deficient number, since it is larger than the sum of its proper divisors (13189883).

66555013 is a wasteful number, since it uses less digits than its factorization.

66555013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 66555013 is about 8158.1255812840. The cubic root of 66555013 is about 405.2536398291.

The spelling of 66555013 in words is "sixty-six million, five hundred fifty-five thousand, thirteen".