66426905 has 8 divisors (see below), whose sum is σ = 84401352. Its totient is φ = 50015488.

The previous prime is 66426887. The next prime is 66426923. The reversal of 66426905 is 50962466.

It is an interprime number because it is at equal distance from previous prime (66426887) and next prime (66426923).

It can be written as a sum of positive squares in 4 ways, for example, as 30558784 + 35868121 = 5528^2 + 5989^2 .

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 66426905 - 2¹⁴ = 66410521 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, 390662 + ... + 390831.

It is an arithmetic number, because the mean of its divisors is an integer number (10550169).

Almost surely, 2^66426905 is an apocalyptic number.

It is an amenable number.

66426905 is a deficient number, since it is larger than the sum of its proper divisors (17974447).

66426905 is a wasteful number, since it uses less digits than its factorization.

66426905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781515.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 66426905 is about 8150.2702409184. The cubic root of 66426905 is about 404.9934561763.

The spelling of 66426905 in words is "sixty-six million, four hundred twenty-six thousand, nine hundred five".