291556775851 has 32 divisors (see below), whose sum is σ = 324366100416. Its totient is φ = 262022112000.

The previous prime is 291556775791. The next prime is 291556775869. The reversal of 291556775851 is 158577655192.

It is a de Polignac number, because none of the positive numbers 2^k-291556775851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 291556775851.

It is not an unprimeable number, because it can be changed into a prime (291556775051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117894751 + ... + 117897223.

It is an arithmetic number, because the mean of its divisors is an integer number (10136440638).

Almost surely, 2^291556775851 is an apocalyptic number.

291556775851 is a deficient number, since it is larger than the sum of its proper divisors (32809324565).

291556775851 is a wasteful number, since it uses less digits than its factorization.

291556775851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484 (or 3462 counting only the distinct ones).

The product of its digits is 26460000, while the sum is 61.

The spelling of 291556775851 in words is "two hundred ninety-one billion, five hundred fifty-six million, seven hundred seventy-five thousand, eight hundred fifty-one".