1005155005511 has 4 divisors (see below), whose sum is σ = 1026541282272. Its totient is φ = 983768728752.

The previous prime is 1005155005487. The next prime is 1005155005541. The reversal of 1005155005511 is 1155005515001.

It is a happy number.

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 1005155005511 - 2²⁶ = 1005087896647 is a prime.

It is a super-2 number, since 2×1005155005511² (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 (1005155005541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10693138310 + ... + 10693138403.

It is an arithmetic number, because the mean of its divisors is an integer number (256635320568).

Almost surely, 2^{1005155005511} is an apocalyptic number.

1005155005511 is a deficient number, since it is larger than the sum of its proper divisors (21386276761).

1005155005511 is an equidigital number, since it uses as much as digits as its factorization.

1005155005511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21386276760.

The product of its (nonzero) digits is 3125, while the sum is 29.

The spelling of 1005155005511 in words is "one trillion, five billion, one hundred fifty-five million, five thousand, five hundred eleven".