991450352656 has 135 divisors (see below), whose sum is σ = 2048779593021. Its totient is φ = 464752434432.

The previous prime is 991450352617. The next prime is 991450352681. The reversal of 991450352656 is 656253054199.

The square root of 991450352656 is 995716.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 582382659600 + 409067693056 = 763140^2 + 639584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 991450352597 and 991450352606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7236863820 + ... + 7236863956.

Almost surely, 2^991450352656 is an apocalyptic number.

991450352656 is the 995716-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991450352656

991450352656 is an abundant number, since it is smaller than the sum of its proper divisors (1057329240365).

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

991450352656 is an equidigital number, since it uses as much as digits as its factorization.

991450352656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 55.

The spelling of 991450352656 in words is "nine hundred ninety-one billion, four hundred fifty million, three hundred fifty-two thousand, six hundred fifty-six".