1027921681556 has 96 divisors (see below), whose sum is σ = 2383118164224. Its totient is φ = 375588864000.

The previous prime is 1027921681487. The next prime is 1027921681601. The reversal of 1027921681556 is 6551861297201.

1027921681556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1027921681556² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1027921681498 and 1027921681507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1121996 + ... + 1820636.

It is an arithmetic number, because the mean of its divisors is an integer number (24824147544).

Almost surely, 2^{1027921681556} 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 1027921681556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1191559082112).

1027921681556 is an abundant number, since it is smaller than the sum of its proper divisors (1355196482668).

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

1027921681556 is a wasteful number, since it uses less digits than its factorization.

1027921681556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698961 (or 698959 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 1027921681556 in words is "one trillion, twenty-seven billion, nine hundred twenty-one million, six hundred eighty-one thousand, five hundred fifty-six".