1291978675359 has 6 divisors (see below), whose sum is σ = 1866191419976. Its totient is φ = 861319116900.

The previous prime is 1291978675357. The next prime is 1291978675397. The reversal of 1291978675359 is 9535768791921.

1291978675359 is a `hidden beast` number, since 1 + 2 + 9 + 1 + 9 + 7 + 86 + 7 + 535 + 9 = 666.

It is not a de Polignac number, because 1291978675359 - 2¹ = 1291978675357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291978675357) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71776593067 + ... + 71776593084.

Almost surely, 2^{1291978675359} is an apocalyptic number.

1291978675359 is a deficient number, since it is larger than the sum of its proper divisors (574212744617).

1291978675359 is a wasteful number, since it uses less digits than its factorization.

1291978675359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143553186157 (or 143553186154 counting only the distinct ones).

The product of its digits is 257191200, while the sum is 72.

The spelling of 1291978675359 in words is "one trillion, two hundred ninety-one billion, nine hundred seventy-eight million, six hundred seventy-five thousand, three hundred fifty-nine".