7681398911 has 4 divisors (see below), whose sum is σ = 7703409000. Its totient is φ = 7659388824.

The previous prime is 7681398889. The next prime is 7681398929. The reversal of 7681398911 is 1198931867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1198931867 = 7 ⋅171275981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7681398911 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 (7681398971) 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, 11004521 + ... + 11005218.

It is an arithmetic number, because the mean of its divisors is an integer number (1925852250).

Almost surely, 2^7681398911 is an apocalyptic number.

7681398911 is a deficient number, since it is larger than the sum of its proper divisors (22010089).

7681398911 is a wasteful number, since it uses less digits than its factorization.

7681398911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22010088.

The product of its digits is 653184, while the sum is 53.

The square root of 7681398911 is about 87643.5902448091. The cubic root of 7681398911 is about 1973.0894442473.

The spelling of 7681398911 in words is "seven billion, six hundred eighty-one million, three hundred ninety-eight thousand, nine hundred eleven".