1056665556 has 36 divisors (see below), whose sum is σ = 2672714772. Its totient is φ = 351997824.

The previous prime is 1056665551. The next prime is 1056665569. The reversal of 1056665556 is 6555666501.

It can be written as a sum of positive squares in 2 ways, for example, as 417384900 + 639280656 = 20430^2 + 25284^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1056665556² = 2233084194473578272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056665551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53920 + ... + 70856.

It is an arithmetic number, because the mean of its divisors is an integer number (74242077).

Almost surely, 2^1056665556 is an apocalyptic number.

It is an amenable number.

1056665556 is an abundant number, since it is smaller than the sum of its proper divisors (1616049216).

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

1056665556 is a wasteful number, since it uses less digits than its factorization.

1056665556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18680 (or 18675 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 1056665556 is about 32506.3925405450. The cubic root of 1056665556 is about 1018.5425667416.

The spelling of 1056665556 in words is "one billion, fifty-six million, six hundred sixty-five thousand, five hundred fifty-six".