1061561655 has 48 divisors (see below), whose sum is σ = 2294083584. Its totient is φ = 441167040.

The previous prime is 1061561653. The next prime is 1061561671. The reversal of 1061561655 is 5561651601.

1061561655 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1061561655 - 2¹ = 1061561653 is a prime.

It is a super-2 number, since 2×1061561655² = 2253826294732678050, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149719 + ... + 156648.

It is an arithmetic number, because the mean of its divisors is an integer number (47793408).

Almost surely, 2^1061561655 is an apocalyptic number.

1061561655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1061561655 is an abundant number, since it is smaller than the sum of its proper divisors (1232521929).

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

1061561655 is a wasteful number, since it uses less digits than its factorization.

1061561655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306396 (or 306393 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1061561655 is about 32581.6152914493. The cubic root of 1061561655 is about 1020.1132947973.

The spelling of 1061561655 in words is "one billion, sixty-one million, five hundred sixty-one thousand, six hundred fifty-five".