991199966622 has 16 divisors (see below), whose sum is σ = 2030751151632. Its totient is φ = 322341452480.

The previous prime is 991199966621. The next prime is 991199966633. The reversal of 991199966622 is 226669991199.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991199966621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2014633833 + ... + 2014634324.

It is an arithmetic number, because the mean of its divisors is an integer number (126921946977).

Almost surely, 2^991199966622 is an apocalyptic number.

991199966622 is an abundant number, since it is smaller than the sum of its proper divisors (1039551185010).

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

991199966622 is a wasteful number, since it uses less digits than its factorization.

991199966622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029268203.

The product of its digits is 51018336, while the sum is 69.

The spelling of 991199966622 in words is "nine hundred ninety-one billion, one hundred ninety-nine million, nine hundred sixty-six thousand, six hundred twenty-two".