10566561553 has 4 divisors (see below), whose sum is σ = 10631387248. Its totient is φ = 10501735860.

The previous prime is 10566561547. The next prime is 10566561557. The reversal of 10566561553 is 35516566501.

It is a happy number.

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 not a de Polignac number, because 10566561553 - 2³³ = 1976626961 is a prime.

It is a super-2 number, since 2×10566561553² (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 (10566561557) 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, 32412603 + ... + 32412928.

It is an arithmetic number, because the mean of its divisors is an integer number (2657846812).

Almost surely, 2^10566561553 is an apocalyptic number.

It is an amenable number.

10566561553 is a deficient number, since it is larger than the sum of its proper divisors (64825695).

10566561553 is an equidigital number, since it uses as much as digits as its factorization.

10566561553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64825694.

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 10566561553 in words is "ten billion, five hundred sixty-six million, five hundred sixty-one thousand, five hundred fifty-three".