1291877745663 has 8 divisors (see below), whose sum is σ = 1722509722800. Its totient is φ = 861248799488.

The previous prime is 1291877745647. The next prime is 1291877745671. The reversal of 1291877745663 is 3665477781921.

It is a Cunningham number, because it is equal to 1136608²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1291877745663 - 2⁴ = 1291877745647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291877745594 and 1291877745603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291877745563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568303 + ... + 1704911.

It is an arithmetic number, because the mean of its divisors is an integer number (215313715350).

Almost surely, 2^{1291877745663} is an apocalyptic number.

1291877745663 is a deficient number, since it is larger than the sum of its proper divisors (430631977137).

1291877745663 is a wasteful number, since it uses less digits than its factorization.

1291877745663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515481.

The product of its digits is 106686720, while the sum is 66.

The spelling of 1291877745663 in words is "one trillion, two hundred ninety-one billion, eight hundred seventy-seven million, seven hundred forty-five thousand, six hundred sixty-three".