1291766816890 has 16 divisors (see below), whose sum is σ = 2536560295200. Its totient is φ = 469733387920.

The previous prime is 1291766816839. The next prime is 1291766816953. The reversal of 1291766816890 is 986186671921.

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 7 ways as a sum of consecutive naturals, for example, 5871667240 + ... + 5871667459.

It is an arithmetic number, because the mean of its divisors is an integer number (158535018450).

Almost surely, 2^{1291766816890} is an apocalyptic number.

1291766816890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291766816890 is a deficient number, since it is larger than the sum of its proper divisors (1244793478310).

1291766816890 is a wasteful number, since it uses less digits than its factorization.

1291766816890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11743334717.

The product of its (nonzero) digits is 15676416, while the sum is 64.

The spelling of 1291766816890 in words is "one trillion, two hundred ninety-one billion, seven hundred sixty-six million, eight hundred sixteen thousand, eight hundred ninety".