1005551520123 has 32 divisors (see below), whose sum is σ = 1522512806400. Its totient is φ = 586449317376.

The previous prime is 1005551520101. The next prime is 1005551520167. The reversal of 1005551520123 is 3210251555001.

It is not a de Polignac number, because 1005551520123 - 2⁶ = 1005551520059 is a prime.

It is a super-2 number, since 2×1005551520123² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1005551520173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9738463 + ... + 9841176.

It is an arithmetic number, because the mean of its divisors is an integer number (47578525200).

Almost surely, 2^{1005551520123} is an apocalyptic number.

1005551520123 is a deficient number, since it is larger than the sum of its proper divisors (516961286277).

1005551520123 is a wasteful number, since it uses less digits than its factorization.

1005551520123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19579731.

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 1005551520123 in words is "one trillion, five billion, five hundred fifty-one million, five hundred twenty thousand, one hundred twenty-three".