7121664668 has 12 divisors (see below), whose sum is σ = 12518802240. Its totient is φ = 3544864032.

The previous prime is 7121664629. The next prime is 7121664691. The reversal of 7121664668 is 8664661217.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3991073 + ... + 3992856.

It is an arithmetic number, because the mean of its divisors is an integer number (1043233520).

Almost surely, 2^7121664668 is an apocalyptic number.

It is an amenable number.

7121664668 is a deficient number, since it is larger than the sum of its proper divisors (5397137572).

7121664668 is a wasteful number, since it uses less digits than its factorization.

7121664668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7984156 (or 7984154 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The square root of 7121664668 is about 84389.9559663352. The cubic root of 7121664668 is about 1923.9502607866.

The spelling of 7121664668 in words is "seven billion, one hundred twenty-one million, six hundred sixty-four thousand, six hundred sixty-eight".