66016771557055 has 32 divisors (see below), whose sum is σ = 87280540089408. Its totient is φ = 47535237888000.

The previous prime is 66016771557019. The next prime is 66016771557067. The reversal of 66016771557055 is 55075517761066.

It is not a de Polignac number, because 66016771557055 - 2³³ = 66008181622463 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66016771556984 and 66016771557002.

It is a congruent number.

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, 180538167 + ... + 180903463.

It is an arithmetic number, because the mean of its divisors is an integer number (2727516877794).

Almost surely, 2^{66016771557055} is an apocalyptic number.

66016771557055 is a deficient number, since it is larger than the sum of its proper divisors (21263768532353).

66016771557055 is a wasteful number, since it uses less digits than its factorization.

66016771557055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397947.

The product of its (nonzero) digits is 46305000, while the sum is 61.

The spelling of 66016771557055 in words is "sixty-six trillion, sixteen billion, seven hundred seventy-one million, five hundred fifty-seven thousand, fifty-five".