66002405 has 16 divisors (see below), whose sum is σ = 93640320. Its totient is φ = 43697472.

The previous prime is 66002401. The next prime is 66002407. The reversal of 66002405 is 50420066.

It is not a de Polignac number, because 66002405 - 2² = 66002401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66002401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31499 + ... + 33528.

It is an arithmetic number, because the mean of its divisors is an integer number (5852520).

Almost surely, 2^66002405 is an apocalyptic number.

It is an amenable number.

66002405 is a deficient number, since it is larger than the sum of its proper divisors (27637915).

66002405 is a wasteful number, since it uses less digits than its factorization.

66002405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65068.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 66002405 is about 8124.1864208055. The cubic root of 66002405 is about 404.1289106805.

The spelling of 66002405 in words is "sixty-six million, two thousand, four hundred five".