955898857991 has 32 divisors (see below), whose sum is σ = 1216368768000. Its totient is φ = 744686641440.

The previous prime is 955898857867. The next prime is 955898857993. The reversal of 955898857991 is 199758898559.

It is a de Polignac number, because none of the positive numbers 2^k-955898857991 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 (955898857993) 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, 18042446 + ... + 18095348.

It is an arithmetic number, because the mean of its divisors is an integer number (38011524000).

Almost surely, 2^955898857991 is an apocalyptic number.

955898857991 is a deficient number, since it is larger than the sum of its proper divisors (260469910009).

955898857991 is a wasteful number, since it uses less digits than its factorization.

955898857991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57724 (or 57710 counting only the distinct ones).

The product of its digits is 2939328000, while the sum is 83.

The spelling of 955898857991 in words is "nine hundred fifty-five billion, eight hundred ninety-eight million, eight hundred fifty-seven thousand, nine hundred ninety-one".