1000555100123 has 4 divisors (see below), whose sum is σ = 1002176745960. Its totient is φ = 998933454288.

The previous prime is 1000555100053. The next prime is 1000555100131. The reversal of 1000555100123 is 3210015550001.

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 1000555100123 - 2²² = 1000550905819 is a prime.

It is a super-2 number, since 2×1000555100123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000555100143) 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, 810821993 + ... + 810823226.

It is an arithmetic number, because the mean of its divisors is an integer number (250544186490).

Almost surely, 2^{1000555100123} is an apocalyptic number.

1000555100123 is a deficient number, since it is larger than the sum of its proper divisors (1621645837).

1000555100123 is an equidigital number, since it uses as much as digits as its factorization.

1000555100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621645836.

The product of its (nonzero) digits is 750, while the sum is 23.

The spelling of 1000555100123 in words is "one trillion, five hundred fifty-five million, one hundred thousand, one hundred twenty-three".