66601505 has 4 divisors (see below), whose sum is σ = 79921812. Its totient is φ = 53281200.

The previous prime is 66601499. The next prime is 66601511. The reversal of 66601505 is 50510666.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66601499) and next prime (66601511).

It can be written as a sum of positive squares in 2 ways, for example, as 39488656 + 27112849 = 6284^2 + 5207^2 .

It is not a de Polignac number, because 66601505 - 2¹² = 66597409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6660146 + ... + 6660155.

It is an arithmetic number, because the mean of its divisors is an integer number (19980453).

Almost surely, 2^66601505 is an apocalyptic number.

It is an amenable number.

66601505 is a deficient number, since it is larger than the sum of its proper divisors (13320307).

66601505 is a wasteful number, since it uses less digits than its factorization.

66601505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13320306.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 66601505 is about 8160.9745128875. The cubic root of 66601505 is about 405.3479811663.

The spelling of 66601505 in words is "sixty-six million, six hundred one thousand, five hundred five".