10661415809 has 16 divisors (see below), whose sum is σ = 12021374976. Its totient is φ = 9367390800.

The previous prime is 10661415797. The next prime is 10661415827. The reversal of 10661415809 is 90851416601.

10661415809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 10661415809 - 2¹² = 10661411713 is a prime.

It is a super-2 number, since 2×10661415809² (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 (10661412809) 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 15 ways as a sum of consecutive naturals, for example, 248504 + ... + 288230.

It is an arithmetic number, because the mean of its divisors is an integer number (751335936).

Almost surely, 2^10661415809 is an apocalyptic number.

It is an amenable number.

10661415809 is a deficient number, since it is larger than the sum of its proper divisors (1359959167).

10661415809 is a wasteful number, since it uses less digits than its factorization.

10661415809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40556.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 10661415809 in words is "ten billion, six hundred sixty-one million, four hundred fifteen thousand, eight hundred nine".