774045998991 has 32 divisors (see below), whose sum is σ = 1150224992000. Its totient is φ = 514462485024.

The previous prime is 774045998989. The next prime is 774045998993. The reversal of 774045998991 is 199899540477.

774045998991 is a `hidden beast` number, since 7 + 7 + 4 + 0 + 459 + 9 + 89 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (774045998989) and next prime (774045998993).

It is not a de Polignac number, because 774045998991 - 2¹ = 774045998989 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 (774045998993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11816856 + ... + 11882178.

It is an arithmetic number, because the mean of its divisors is an integer number (35944531000).

Almost surely, 2^774045998991 is an apocalyptic number.

774045998991 is a deficient number, since it is larger than the sum of its proper divisors (376178993009).

774045998991 is a wasteful number, since it uses less digits than its factorization.

774045998991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66660 (or 66654 counting only the distinct ones).

The product of its (nonzero) digits is 205752960, while the sum is 72.

The spelling of 774045998991 in words is "seven hundred seventy-four billion, forty-five million, nine hundred ninety-eight thousand, nine hundred ninety-one".