66050405 has 4 divisors (see below), whose sum is σ = 79260492. Its totient is φ = 52840320.

The previous prime is 66050401. The next prime is 66050407. The reversal of 66050405 is 50405066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50405066 = 2 ⋅25202533.

It can be written as a sum of positive squares in 2 ways, for example, as 21548164 + 44502241 = 4642^2 + 6671^2 .

It is not a de Polignac number, because 66050405 - 2² = 66050401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66050401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6605036 + ... + 6605045.

It is an arithmetic number, because the mean of its divisors is an integer number (19815123).

Almost surely, 2^66050405 is an apocalyptic number.

It is an amenable number.

66050405 is a deficient number, since it is larger than the sum of its proper divisors (13210087).

66050405 is a wasteful number, since it uses less digits than its factorization.

66050405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13210086.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 66050405 is about 8127.1400258640. The cubic root of 66050405 is about 404.2268540165.

The spelling of 66050405 in words is "sixty-six million, fifty thousand, four hundred five".