1005550005551 has 16 divisors (see below), whose sum is σ = 1237624249344. Its totient is φ = 795584420064.

The previous prime is 1005550005461. The next prime is 1005550005563. The reversal of 1005550005551 is 1555000555001.

It is not a de Polignac number, because 1005550005551 - 2³⁰ = 1004476263727 is a prime.

It is a super-2 number, since 2×1005550005551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005550505551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7438970 + ... + 7572936.

It is an arithmetic number, because the mean of its divisors is an integer number (77351515584).

Almost surely, 2^{1005550005551} is an apocalyptic number.

1005550005551 is a deficient number, since it is larger than the sum of its proper divisors (232074243793).

1005550005551 is a wasteful number, since it uses less digits than its factorization.

1005550005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216470.

The product of its (nonzero) digits is 15625, while the sum is 32.

The spelling of 1005550005551 in words is "one trillion, five billion, five hundred fifty million, five thousand, five hundred fifty-one".