7771499681 has 16 divisors (see below), whose sum is σ = 8951251200. Its totient is φ = 6672877200.

The previous prime is 7771499633. The next prime is 7771499683. The reversal of 7771499681 is 1869941777.

It is not a de Polignac number, because 7771499681 - 2¹⁴ = 7771483297 is a prime.

It is a super-2 number, since 2×7771499681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7771499681.

It is not an unprimeable number, because it can be changed into a prime (7771499683) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13010 + ... + 125348.

It is an arithmetic number, because the mean of its divisors is an integer number (559453200).

Almost surely, 2^7771499681 is an apocalyptic number.

It is an amenable number.

7771499681 is a deficient number, since it is larger than the sum of its proper divisors (1179751519).

7771499681 is a wasteful number, since it uses less digits than its factorization.

7771499681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112700.

The product of its digits is 5334336, while the sum is 59.

The square root of 7771499681 is about 88156.1097202003. The cubic root of 7771499681 is about 1980.7740809849.

The spelling of 7771499681 in words is "seven billion, seven hundred seventy-one million, four hundred ninety-nine thousand, six hundred eighty-one".