1061078525561 has 4 divisors (see below), whose sum is σ = 1061321173092. Its totient is φ = 1060835878032.

The previous prime is 1061078525531. The next prime is 1061078525581. The reversal of 1061078525561 is 1655258701601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 899735719936 + 161342805625 = 948544^2 + 401675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1061078525561 is a prime.

It is a super-2 number, since 2×1061078525561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061078525531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121317206 + ... + 121325951.

It is an arithmetic number, because the mean of its divisors is an integer number (265330293273).

Almost surely, 2^{1061078525561} is an apocalyptic number.

It is an amenable number.

1061078525561 is a deficient number, since it is larger than the sum of its proper divisors (242647531).

1061078525561 is an equidigital number, since it uses as much as digits as its factorization.

1061078525561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242647530.

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 1061078525561 in words is "one trillion, sixty-one billion, seventy-eight million, five hundred twenty-five thousand, five hundred sixty-one".