1061061105561 has 4 divisors (see below), whose sum is σ = 1414748140752. Its totient is φ = 707374070372.

The previous prime is 1061061105557. The next prime is 1061061105563. The reversal of 1061061105561 is 1655011601601.

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 1061061105561 - 2² = 1061061105557 is a prime.

It is a super-2 number, since 2×1061061105561² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1061061105563) 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, 176843517591 + ... + 176843517596.

It is an arithmetic number, because the mean of its divisors is an integer number (353687035188).

Almost surely, 2^{1061061105561} is an apocalyptic number.

It is an amenable number.

1061061105561 is a deficient number, since it is larger than the sum of its proper divisors (353687035191).

1061061105561 is an equidigital number, since it uses as much as digits as its factorization.

1061061105561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353687035190.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 1061061105561 in words is "one trillion, sixty-one billion, sixty-one million, one hundred five thousand, five hundred sixty-one".