66625419 has 32 divisors (see below), whose sum is σ = 109780480. Its totient is φ = 35085312.

The previous prime is 66625409. The next prime is 66625423. The reversal of 66625419 is 91452666.

66625419 = 2175² + 2176² + ... + 2188².

It is not a de Polignac number, because 66625419 - 2⁵ = 66625387 is a prime.

It is a super-2 number, since 2×66625419² = 8877892913851122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66625409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12507 + ... + 17019.

It is an arithmetic number, because the mean of its divisors is an integer number (3430640).

Almost surely, 2^66625419 is an apocalyptic number.

66625419 is a deficient number, since it is larger than the sum of its proper divisors (43155061).

66625419 is a wasteful number, since it uses less digits than its factorization.

66625419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579.

The product of its digits is 77760, while the sum is 39.

The square root of 66625419 is about 8162.4395250440. The cubic root of 66625419 is about 405.3964902387.

The spelling of 66625419 in words is "sixty-six million, six hundred twenty-five thousand, four hundred nineteen".