7793477959681 has 4 divisors (see below), whose sum is σ = 7833858674692. Its totient is φ = 7753097244672.

The previous prime is 7793477959667. The next prime is 7793477959693. The reversal of 7793477959681 is 1869597743977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3887285424400 + 3906192535281 = 1971620^2 + 1976409^2 .

It is a cyclic number.

It is not a de Polignac number, because 7793477959681 - 2⁴¹ = 5594454704129 is a prime.

It is a super-2 number, since 2×7793477959681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7793477959595 and 7793477959604.

It is not an unprimeable number, because it can be changed into a prime (7793477959661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20190357216 + ... + 20190357601.

It is an arithmetic number, because the mean of its divisors is an integer number (1958464668673).

Almost surely, 2^{7793477959681} is an apocalyptic number.

It is an amenable number.

7793477959681 is a deficient number, since it is larger than the sum of its proper divisors (40380715011).

7793477959681 is a wasteful number, since it uses less digits than its factorization.

7793477959681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40380715010.

The product of its digits is 5040947520, while the sum is 82.

The spelling of 7793477959681 in words is "seven trillion, seven hundred ninety-three billion, four hundred seventy-seven million, nine hundred fifty-nine thousand, six hundred eighty-one".