1061561656 has 8 divisors (see below), whose sum is σ = 1990428120. Its totient is φ = 530780824.

The previous prime is 1061561653. The next prime is 1061561671. The reversal of 1061561656 is 6561651601.

1061561656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1061561656² = 2253826298978924672, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) 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 (1061561653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66347596 + ... + 66347611.

It is an arithmetic number, because the mean of its divisors is an integer number (248803515).

Almost surely, 2^1061561656 is an apocalyptic number.

It is an amenable number.

1061561656 is a deficient number, since it is larger than the sum of its proper divisors (928866464).

1061561656 is a wasteful number, since it uses less digits than its factorization.

1061561656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132695213 (or 132695209 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1061561656 is about 32581.6153067953. The cubic root of 1061561656 is about 1020.1132951176.

The spelling of 1061561656 in words is "one billion, sixty-one million, five hundred sixty-one thousand, six hundred fifty-six".