1061556056 has 64 divisors (see below), whose sum is σ = 2220825600. Its totient is φ = 471664000.

The previous prime is 1061556031. The next prime is 1061556061. The reversal of 1061556056 is 6506551601.

It is a super-2 number, since 2×1061556056² = 2253802520060550272, which contains 22 as substring.

It is a congruent number.

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, 736985 + ... + 738423.

It is an arithmetic number, because the mean of its divisors is an integer number (34700400).

Almost surely, 2^1061556056 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 1061556056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1110412800).

1061556056 is an abundant number, since it is smaller than the sum of its proper divisors (1159269544).

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

1061556056 is a wasteful number, since it uses less digits than its factorization.

1061556056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1061556056 is about 32581.5293686469. The cubic root of 1061556056 is about 1020.1115013312. Note that the first 3 decimals are identical.

It can be divided in two parts, 106155 and 6056, that added together give a palindrome (112211).

The spelling of 1061556056 in words is "one billion, sixty-one million, five hundred fifty-six thousand, fifty-six".