1997550416186 has 32 divisors (see below), whose sum is σ = 3534439361040. Its totient is φ = 837793022976.

The previous prime is 1997550416179. The next prime is 1997550416207. The reversal of 1997550416186 is 6816140557991.

It can be written as a sum of positive squares in 8 ways, for example, as 288728902225 + 1708821513961 = 537335^2 + 1307219^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77906921 + ... + 77932556.

Almost surely, 2^{1997550416186} is an apocalyptic number.

1997550416186 is a deficient number, since it is larger than the sum of its proper divisors (1536888944854).

1997550416186 is a wasteful number, since it uses less digits than its factorization.

1997550416186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155839538.

The product of its (nonzero) digits is 16329600, while the sum is 62.

The spelling of 1997550416186 in words is "one trillion, nine hundred ninety-seven billion, five hundred fifty million, four hundred sixteen thousand, one hundred eighty-six".