1066005551655 has 48 divisors (see below), whose sum is σ = 2018169593856. Its totient is φ = 516222970560.

The previous prime is 1066005551651. The next prime is 1066005551693. The reversal of 1066005551655 is 5561555006601.

It is not a de Polignac number, because 1066005551655 - 2² = 1066005551651 is a prime.

It is a super-2 number, since 2×1066005551655² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1066005551655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066005551651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 900967 + ... + 1715736.

It is an arithmetic number, because the mean of its divisors is an integer number (42045199872).

Almost surely, 2^{1066005551655} is an apocalyptic number.

1066005551655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1066005551655 is a deficient number, since it is larger than the sum of its proper divisors (952164042201).

1066005551655 is a wasteful number, since it uses less digits than its factorization.

1066005551655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617548 (or 2617545 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 1066005551655 in words is "one trillion, sixty-six billion, five million, five hundred fifty-one thousand, six hundred fifty-five".