1085661556 has 12 divisors (see below), whose sum is σ = 2171323168. Its totient is φ = 465283512.

The previous prime is 1085661553. The next prime is 1085661557. The reversal of 1085661556 is 6551665801.

1085661556 is an admirable number.

It is a super-2 number, since 2×1085661556² = 2357322028352682272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1085661553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19386786 + ... + 19386841.

Almost surely, 2^1085661556 is an apocalyptic number.

It is an amenable number.

1085661556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1085661556 is a wasteful number, since it uses less digits than its factorization.

1085661556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38773638 (or 38773636 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 1085661556 is about 32949.3786891346. The cubic root of 1085661556 is about 1027.7752452169.

The spelling of 1085661556 in words is "one billion, eighty-five million, six hundred sixty-one thousand, five hundred fifty-six".