611721079876 has 9 divisors (see below), whose sum is σ = 1070514627231. Its totient is φ = 305859757812.

The previous prime is 611721079859. The next prime is 611721079877. The reversal of 611721079876 is 678970127116.

The square root of 611721079876 is 782126.

It is a perfect power (a square), and thus also a powerful number.

611721079876 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611721079877) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1368721 + ... + 1759783.

Almost surely, 2^611721079876 is an apocalyptic number.

611721079876 is the 782126-th square number.

It is an amenable number.

611721079876 is a deficient number, since it is larger than the sum of its proper divisors (458793547355).

611721079876 is an frugal number, since it uses more digits than its factorization.

611721079876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782130 (or 391065 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 55.

The spelling of 611721079876 in words is "six hundred eleven billion, seven hundred twenty-one million, seventy-nine thousand, eight hundred seventy-six".