1000556105551 has 8 divisors (see below), whose sum is σ = 1059520593744. Its totient is φ = 941603644800.

The previous prime is 1000556105467. The next prime is 1000556105557. The reversal of 1000556105551 is 1555016550001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000556105551 - 2²⁹ = 1000019234639 is a prime.

It is a super-2 number, since 2×1000556105551² (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 (1000556105557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2835300 + ... + 3168601.

It is an arithmetic number, because the mean of its divisors is an integer number (132440074218).

Almost surely, 2^{1000556105551} is an apocalyptic number.

1000556105551 is a deficient number, since it is larger than the sum of its proper divisors (58964488193).

1000556105551 is an equidigital number, since it uses as much as digits as its factorization.

1000556105551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6013721.

The product of its (nonzero) digits is 18750, while the sum is 34.

The spelling of 1000556105551 in words is "one trillion, five hundred fifty-six million, one hundred five thousand, five hundred fifty-one".