1005555055551 has 16 divisors (see below), whose sum is σ = 1354842424320. Its totient is φ = 663335244000.

The previous prime is 1005555055543. The next prime is 1005555055559. The reversal of 1005555055551 is 1555505555001.

It is an interprime number because it is at equal distance from previous prime (1005555055543) and next prime (1005555055559).

It is not a de Polignac number, because 1005555055551 - 2³ = 1005555055543 is a prime.

It is a super-2 number, since 2×1005555055551² (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 (1005555055559) 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, 1801755 + ... + 2292908.

It is an arithmetic number, because the mean of its divisors is an integer number (84677651520).

Almost surely, 2^{1005555055551} is an apocalyptic number.

1005555055551 is a deficient number, since it is larger than the sum of its proper divisors (349287368769).

1005555055551 is a wasteful number, since it uses less digits than its factorization.

1005555055551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095526.

The product of its (nonzero) digits is 390625, while the sum is 42.

It can be divided in two parts, 10055550 and 55551, that added together give a palindrome (10111101).

The spelling of 1005555055551 in words is "one trillion, five billion, five hundred fifty-five million, fifty-five thousand, five hundred fifty-one".