1061666655 has 64 divisors (see below), whose sum is σ = 2022451200. Its totient is φ = 465292800.

The previous prime is 1061666653. The next prime is 1061666659. The reversal of 1061666655 is 5566661601.

It is not a de Polignac number, because 1061666655 - 2¹ = 1061666653 is a prime.

It is a super-2 number, since 2×1061666655² = 2254272172677778050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061666653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 458641 + ... + 460949.

It is an arithmetic number, because the mean of its divisors is an integer number (31600800).

Almost surely, 2^1061666655 is an apocalyptic number.

1061666655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1061666655 is a deficient number, since it is larger than the sum of its proper divisors (960784545).

1061666655 is a wasteful number, since it uses less digits than its factorization.

1061666655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 1061666655 is about 32583.2265897655. The cubic root of 1061666655 is about 1020.1469271238.

The spelling of 1061666655 in words is "one billion, sixty-one million, six hundred sixty-six thousand, six hundred fifty-five".