611387510856 has 64 divisors (see below), whose sum is σ = 1556912923200. Its totient is φ = 200014564608.

The previous prime is 611387510849. The next prime is 611387510861. The reversal of 611387510856 is 658015783116.

It is a junction number, because it is equal to n+sod(n) for n = 611387510799 and 611387510808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515830 + ... + 1220186.

It is an arithmetic number, because the mean of its divisors is an integer number (24326764425).

Almost surely, 2^611387510856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 611387510856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778456461600).

611387510856 is an abundant number, since it is smaller than the sum of its proper divisors (945525412344).

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

611387510856 is a wasteful number, since it uses less digits than its factorization.

611387510856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705038 (or 705034 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 611387510856 in words is "six hundred eleven billion, three hundred eighty-seven million, five hundred ten thousand, eight hundred fifty-six".