10509125561 has 4 divisors (see below), whose sum is σ = 11464500624. Its totient is φ = 9553750500.

The previous prime is 10509125537. The next prime is 10509125573. The reversal of 10509125561 is 16552190501.

10509125561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10509125561 is a prime.

It is a super-2 number, since 2×10509125561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10509125521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477687515 + ... + 477687536.

It is an arithmetic number, because the mean of its divisors is an integer number (2866125156).

Almost surely, 2^10509125561 is an apocalyptic number.

10509125561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10509125561 is a deficient number, since it is larger than the sum of its proper divisors (955375063).

10509125561 is an equidigital number, since it uses as much as digits as its factorization.

10509125561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955375062.

The product of its (nonzero) digits is 13500, while the sum is 35.

The spelling of 10509125561 in words is "ten billion, five hundred nine million, one hundred twenty-five thousand, five hundred sixty-one".