7121706660 has 72 divisors (see below), whose sum is σ = 22541762880. Its totient is φ = 1816550208.

The previous prime is 7121706587. The next prime is 7121706671. The reversal of 7121706660 is 666071217.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 855970 + ... + 864249.

It is an arithmetic number, because the mean of its divisors is an integer number (313080040).

Almost surely, 2^7121706660 is an apocalyptic number.

It is an amenable number.

7121706660 is an abundant number, since it is smaller than the sum of its proper divisors (15420056220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7121706660 is a wasteful number, since it uses less digits than its factorization.

7121706660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720257 (or 1720252 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 7121706660 is about 84390.2047633492. The cubic root of 7121706660 is about 1923.9540422227.

Adding to 7121706660 its reverse (666071217), we get a palindrome (7787777877).

The spelling of 7121706660 in words is "seven billion, one hundred twenty-one million, seven hundred six thousand, six hundred sixty".