1001055005501 has 4 divisors (see below), whose sum is σ = 1001097323100. Its totient is φ = 1001012687904.

The previous prime is 1001055005497. The next prime is 1001055005651. The reversal of 1001055005501 is 1055005501001.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 596870585476 + 404184420025 = 772574^2 + 635755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001055005501 - 2² = 1001055005497 is a prime.

It is a super-2 number, since 2×1001055005501² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001055005101) 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, 21123296 + ... + 21170633.

It is an arithmetic number, because the mean of its divisors is an integer number (250274330775).

Almost surely, 2^{1001055005501} is an apocalyptic number.

It is an amenable number.

1001055005501 is a deficient number, since it is larger than the sum of its proper divisors (42317599).

1001055005501 is an equidigital number, since it uses as much as digits as its factorization.

1001055005501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42317598.

The product of its (nonzero) digits is 625, while the sum is 23.

It can be divided in two parts, 100105500 and 5501, that added together give a palindrome (100111001).

The spelling of 1001055005501 in words is "one trillion, one billion, fifty-five million, five thousand, five hundred one".