1291766766064 has 20 divisors (see below), whose sum is σ = 2503505423880. Its totient is φ = 645700850240.

The previous prime is 1291766766041. The next prime is 1291766766077. The reversal of 1291766766064 is 4606676671921.

It is a super-2 number, since 2×1291766766064² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1291766765993 and 1291766766011.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 11349907 + ... + 11463154.

It is an arithmetic number, because the mean of its divisors is an integer number (125175271194).

Almost surely, 2^{1291766766064} is an apocalyptic number.

It is an amenable number.

1291766766064 is a deficient number, since it is larger than the sum of its proper divisors (1211738657816).

1291766766064 is a wasteful number, since it uses less digits than its factorization.

1291766766064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22816608 (or 22816602 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 61.

The spelling of 1291766766064 in words is "one trillion, two hundred ninety-one billion, seven hundred sixty-six million, seven hundred sixty-six thousand, sixty-four".