66313505 has 4 divisors (see below), whose sum is σ = 79576212. Its totient is φ = 53050800.

The previous prime is 66313501. The next prime is 66313537. The reversal of 66313505 is 50531366.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31550689 + 34762816 = 5617^2 + 5896^2 .

It is not a de Polignac number, because 66313505 - 2² = 66313501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66313501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6631346 + ... + 6631355.

It is an arithmetic number, because the mean of its divisors is an integer number (19894053).

Almost surely, 2^66313505 is an apocalyptic number.

It is an amenable number.

66313505 is a deficient number, since it is larger than the sum of its proper divisors (13262707).

66313505 is a wasteful number, since it uses less digits than its factorization.

66313505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13262706.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 66313505 is about 8143.3104447761. The cubic root of 66313505 is about 404.7628647871.

The spelling of 66313505 in words is "sixty-six million, three hundred thirteen thousand, five hundred five".