66420575 has 12 divisors (see below), whose sum is σ = 88697448. Its totient is φ = 49048800.

The previous prime is 66420559. The next prime is 66420671. The reversal of 66420575 is 57502466.

It is not a de Polignac number, because 66420575 - 2⁴ = 66420559 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101861 + ... + 102510.

It is an arithmetic number, because the mean of its divisors is an integer number (7391454).

Almost surely, 2^66420575 is an apocalyptic number.

66420575 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66420575 is a deficient number, since it is larger than the sum of its proper divisors (22276873).

66420575 is a wasteful number, since it uses less digits than its factorization.

66420575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204394 (or 204389 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 66420575 is about 8149.8819009848. The cubic root of 66420575 is about 404.9805914593.

The spelling of 66420575 in words is "sixty-six million, four hundred twenty thousand, five hundred seventy-five".