1063856661 has 16 divisors (see below), whose sum is σ = 1623033984. Its totient is φ = 607198464.

The previous prime is 1063856579. The next prime is 1063856681. The reversal of 1063856661 is 1666583601.

It is not a de Polignac number, because 1063856661 - 2⁹ = 1063856149 is a prime.

It is a super-2 number, since 2×1063856661² = 2263581990308137842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1063856681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11560 + ... + 47553.

It is an arithmetic number, because the mean of its divisors is an integer number (101439624).

Almost surely, 2^1063856661 is an apocalyptic number.

It is an amenable number.

1063856661 is a deficient number, since it is larger than the sum of its proper divisors (559177323).

1063856661 is an equidigital number, since it uses as much as digits as its factorization.

1063856661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59980.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1063856661 is about 32616.8156171016. The cubic root of 1063856661 is about 1020.8478983915.

The spelling of 1063856661 in words is "one billion, sixty-three million, eight hundred fifty-six thousand, six hundred sixty-one".