291916868551 has 16 divisors (see below), whose sum is σ = 385357029120. Its totient is φ = 214087236480.

The previous prime is 291916868429. The next prime is 291916868603. The reversal of 291916868551 is 155868619192.

It is a cyclic number.

It is not a de Polignac number, because 291916868551 - 2¹⁷ = 291916737479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291916868551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291916868251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111502461 + ... + 111505078.

It is an arithmetic number, because the mean of its divisors is an integer number (24084814320).

Almost surely, 2^291916868551 is an apocalyptic number.

291916868551 is a deficient number, since it is larger than the sum of its proper divisors (93440160569).

291916868551 is a wasteful number, since it uses less digits than its factorization.

291916868551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223007574.

The product of its digits is 9331200, while the sum is 61.

The spelling of 291916868551 in words is "two hundred ninety-one billion, nine hundred sixteen million, eight hundred sixty-eight thousand, five hundred fifty-one".