66990198040515 has 32 divisors (see below), whose sum is σ = 119094151027200. Its totient is φ = 35727965935200.

The previous prime is 66990198040481. The next prime is 66990198040607. The reversal of 66990198040515 is 51504089109966.

66990198040515 is a `hidden beast` number, since 6 + 69 + 9 + 0 + 19 + 8 + 0 + 40 + 515 = 666.

It is a Cunningham number, because it is equal to 8184754²-1.

It is not a de Polignac number, because 66990198040515 - 2¹⁶ = 66990197974979 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40105290 + ... + 41742240.

It is an arithmetic number, because the mean of its divisors is an integer number (3721692219600).

Almost surely, 2^{66990198040515} is an apocalyptic number.

66990198040515 is a deficient number, since it is larger than the sum of its proper divisors (52103952986685).

66990198040515 is a wasteful number, since it uses less digits than its factorization.

66990198040515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940104 (or 1940098 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 63.

The spelling of 66990198040515 in words is "sixty-six trillion, nine hundred ninety billion, one hundred ninety-eight million, forty thousand, five hundred fifteen".