991601828745 has 32 divisors (see below), whose sum is σ = 1734534273024. Its totient is φ = 479738212800.

The previous prime is 991601828743. The next prime is 991601828753. The reversal of 991601828745 is 547828106199.

It is not a de Polignac number, because 991601828745 - 2¹ = 991601828743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991601828743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6413571 + ... + 6566360.

It is an arithmetic number, because the mean of its divisors is an integer number (54204196032).

Almost surely, 2^991601828745 is an apocalyptic number.

It is an amenable number.

991601828745 is a deficient number, since it is larger than the sum of its proper divisors (742932444279).

991601828745 is a wasteful number, since it uses less digits than its factorization.

991601828745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12980413.

The product of its (nonzero) digits is 8709120, while the sum is 60.

The spelling of 991601828745 in words is "nine hundred ninety-one billion, six hundred one million, eight hundred twenty-eight thousand, seven hundred forty-five".