660001055 has 16 divisors (see below), whose sum is σ = 910384704. Its totient is φ = 449952000.

The previous prime is 660001033. The next prime is 660001057. The reversal of 660001055 is 550100066.

It is not a de Polignac number, because 660001055 - 2⁸ = 660000799 is a prime.

It is a super-2 number, since 2×660001055² = 871202785202226050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660001055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660001057) 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 15 ways as a sum of consecutive naturals, for example, 48446 + ... + 60555.

It is an arithmetic number, because the mean of its divisors is an integer number (56899044).

Almost surely, 2^660001055 is an apocalyptic number.

660001055 is a deficient number, since it is larger than the sum of its proper divisors (250383649).

660001055 is a wasteful number, since it uses less digits than its factorization.

660001055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109186.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 660001055 is about 25690.4856902317. The cubic root of 660001055 is about 870.6592330287.

The spelling of 660001055 in words is "six hundred sixty million, one thousand, fifty-five".