7790943394781 has 16 divisors (see below), whose sum is σ = 8158725330480. Its totient is φ = 7434154590720.

The previous prime is 7790943394769. The next prime is 7790943394811. The reversal of 7790943394781 is 1874933490977.

It can be written as a sum of positive squares in 8 ways, for example, as 1835713363225 + 5955230031556 = 1354885^2 + 2440334^2 .

It is a cyclic number.

It is not a de Polignac number, because 7790943394781 - 2³⁸ = 7516065487837 is a prime.

It is a super-2 number, since 2×7790943394781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7790943394681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13250570 + ... + 13826043.

It is an arithmetic number, because the mean of its divisors is an integer number (509920333155).

Almost surely, 2^{7790943394781} is an apocalyptic number.

It is an amenable number.

7790943394781 is a deficient number, since it is larger than the sum of its proper divisors (367781935699).

7790943394781 is a wasteful number, since it uses less digits than its factorization.

7790943394781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27076816.

The product of its (nonzero) digits is 288054144, while the sum is 71.

The spelling of 7790943394781 in words is "seven trillion, seven hundred ninety billion, nine hundred forty-three million, three hundred ninety-four thousand, seven hundred eighty-one".