7111918681 has 4 divisors (see below), whose sum is σ = 8127907072. Its totient is φ = 6095930292.

The previous prime is 7111918609. The next prime is 7111918727. The reversal of 7111918681 is 1868191117.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7111918681 - 2²³ = 7103530073 is a prime.

It is a super-2 number, since 2×7111918681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7111918981) 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, 507994185 + ... + 507994198.

It is an arithmetic number, because the mean of its divisors is an integer number (2031976768).

Almost surely, 2^7111918681 is an apocalyptic number.

It is an amenable number.

7111918681 is a deficient number, since it is larger than the sum of its proper divisors (1015988391).

7111918681 is a wasteful number, since it uses less digits than its factorization.

7111918681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015988390.

The product of its digits is 24192, while the sum is 43.

The square root of 7111918681 is about 84332.1924356292. The cubic root of 7111918681 is about 1923.0722191539.

The spelling of 7111918681 in words is "seven billion, one hundred eleven million, nine hundred eighteen thousand, six hundred eighty-one".