1005501005551 has 4 divisors (see below), whose sum is σ = 1149144006352. Its totient is φ = 861858004752.

The previous prime is 1005501005527. The next prime is 1005501005567. The reversal of 1005501005551 is 1555001055001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1005501005551 - 2⁷ = 1005501005423 is a prime.

It is a super-2 number, since 2×1005501005551² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005501005581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71821500390 + ... + 71821500403.

It is an arithmetic number, because the mean of its divisors is an integer number (287286001588).

Almost surely, 2^{1005501005551} is an apocalyptic number.

1005501005551 is a deficient number, since it is larger than the sum of its proper divisors (143643000801).

1005501005551 is an equidigital number, since it uses as much as digits as its factorization.

1005501005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143643000800.

The product of its (nonzero) digits is 3125, while the sum is 28.

The spelling of 1005501005551 in words is "one trillion, five billion, five hundred one million, five thousand, five hundred fifty-one".