10505555551 has 4 divisors (see below), whose sum is σ = 10505766600. Its totient is φ = 10505344504.

The previous prime is 10505555513. The next prime is 10505555581. The reversal of 10505555551 is 15555550501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15555550501 = 593 ⋅26231957.

It is a cyclic number.

It is not a de Polignac number, because 10505555551 - 2¹³ = 10505547359 is a prime.

It is a super-2 number, since 2×10505555551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10505555551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10505555581) 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, 15120 + ... + 145738.

It is an arithmetic number, because the mean of its divisors is an integer number (2626441650).

Almost surely, 2^10505555551 is an apocalyptic number.

10505555551 is a deficient number, since it is larger than the sum of its proper divisors (211049).

10505555551 is an equidigital number, since it uses as much as digits as its factorization.

10505555551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211048.

The product of its (nonzero) digits is 78125, while the sum is 37.

The spelling of 10505555551 in words is "ten billion, five hundred five million, five hundred fifty-five thousand, five hundred fifty-one".