66428016516 has 96 divisors (see below), whose sum is σ = 172908086400. Its totient is φ = 22054515840.

The previous prime is 66428016503. The next prime is 66428016547. The reversal of 66428016516 is 61561082466.

66428016516 is a `hidden beast` number, since 6 + 6 + 42 + 80 + 16 + 516 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38868670 + ... + 38870378.

It is an arithmetic number, because the mean of its divisors is an integer number (1801125900).

Almost surely, 2^66428016516 is an apocalyptic number.

It is an amenable number.

66428016516 is an abundant number, since it is smaller than the sum of its proper divisors (106480069884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66428016516 is a wasteful number, since it uses less digits than its factorization.

66428016516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946 (or 2938 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 66428016516 in words is "sixty-six billion, four hundred twenty-eight million, sixteen thousand, five hundred sixteen".