66625105 has 4 divisors (see below), whose sum is σ = 79950132. Its totient is φ = 53300080.

The previous prime is 66625099. The next prime is 66625121. The reversal of 66625105 is 50152666.

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 42497361 + 24127744 = 6519^2 + 4912^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66625105 is a prime.

It is a super-2 number, since 2×66625105² = 8877809232522050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6662506 + ... + 6662515.

It is an arithmetic number, because the mean of its divisors is an integer number (19987533).

Almost surely, 2^66625105 is an apocalyptic number.

It is an amenable number.

66625105 is a deficient number, since it is larger than the sum of its proper divisors (13325027).

66625105 is a wasteful number, since it uses less digits than its factorization.

66625105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13325026.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 66625105 is about 8162.4202905756. The cubic root of 66625105 is about 405.3958533711.

The spelling of 66625105 in words is "sixty-six million, six hundred twenty-five thousand, one hundred five".