991876278252 has 36 divisors (see below), whose sum is σ = 2349436631640. Its totient is φ = 325690700544.

The previous prime is 991876278251. The next prime is 991876278347. The reversal of 991876278252 is 252872678199.

It is not an unprimeable number, because it can be changed into a prime (991876278251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9152677 + ... + 9260412.

Almost surely, 2^991876278252 is an apocalyptic number.

It is an amenable number.

991876278252 is an abundant number, since it is smaller than the sum of its proper divisors (1357560353388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991876278252 is a wasteful number, since it uses less digits than its factorization.

991876278252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18413230 (or 18413161 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 66.

The spelling of 991876278252 in words is "nine hundred ninety-one billion, eight hundred seventy-six million, two hundred seventy-eight thousand, two hundred fifty-two".