66510511171144 has 16 divisors (see below), whose sum is σ = 124711212740400. Its totient is φ = 33254187773712.

The previous prime is 66510511170923. The next prime is 66510511171151. The reversal of 66510511171144 is 44117111501566.

It is a self number, because there is not a number n which added to its sum of digits gives 66510511171144.

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, 133211734 + ... + 133710085.

It is an arithmetic number, because the mean of its divisors is an integer number (7794450796275).

Almost surely, 2^{66510511171144} is an apocalyptic number.

It is an amenable number.

66510511171144 is a deficient number, since it is larger than the sum of its proper divisors (58200701569256).

66510511171144 is a wasteful number, since it uses less digits than its factorization.

66510511171144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266952972 (or 266952968 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 66510511171144 in words is "sixty-six trillion, five hundred ten billion, five hundred eleven million, one hundred seventy-one thousand, one hundred forty-four".