66372505 has 8 divisors (see below), whose sum is σ = 84332232. Its totient is φ = 49974528.

The previous prime is 66372431. The next prime is 66372511. The reversal of 66372505 is 50527366.

It can be written as a sum of positive squares in 4 ways, for example, as 3455881 + 62916624 = 1859^2 + 7932^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66372505 - 2¹⁵ = 66339737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390342 + ... + 390511.

It is an arithmetic number, because the mean of its divisors is an integer number (10541529).

Almost surely, 2^66372505 is an apocalyptic number.

It is an amenable number.

66372505 is a deficient number, since it is larger than the sum of its proper divisors (17959727).

66372505 is a wasteful number, since it uses less digits than its factorization.

66372505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780875.

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 66372505 is about 8146.9322447164. The cubic root of 66372505 is about 404.8828701571.

The spelling of 66372505 in words is "sixty-six million, three hundred seventy-two thousand, five hundred five".