66404516 has 12 divisors (see below), whose sum is σ = 123043788. Its totient is φ = 31249152.

The previous prime is 66404501. The next prime is 66404549. The reversal of 66404516 is 61540466.

It can be written as a sum of positive squares in 2 ways, for example, as 59136100 + 7268416 = 7690^2 + 2696^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488201 + ... + 488336.

It is an arithmetic number, because the mean of its divisors is an integer number (10253649).

Almost surely, 2^66404516 is an apocalyptic number.

It is an amenable number.

66404516 is a deficient number, since it is larger than the sum of its proper divisors (56639272).

66404516 is a wasteful number, since it uses less digits than its factorization.

66404516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976558 (or 976556 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 66404516 is about 8148.8966124255. The cubic root of 66404516 is about 404.9479504314.

The spelling of 66404516 in words is "sixty-six million, four hundred four thousand, five hundred sixteen".