1061155643261 has 4 divisors (see below), whose sum is σ = 1212749306592. Its totient is φ = 909561979932.

The previous prime is 1061155643201. The next prime is 1061155643297. The reversal of 1061155643261 is 1623465511601.

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 1061155643261 - 2¹⁰ = 1061155642237 is a prime.

It is a super-2 number, since 2×1061155643261² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061155643201) 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, 75796831655 + ... + 75796831668.

It is an arithmetic number, because the mean of its divisors is an integer number (303187326648).

Almost surely, 2^{1061155643261} is an apocalyptic number.

It is an amenable number.

1061155643261 is a deficient number, since it is larger than the sum of its proper divisors (151593663331).

1061155643261 is an equidigital number, since it uses as much as digits as its factorization.

1061155643261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151593663330.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 1061155643261 in words is "one trillion, sixty-one billion, one hundred fifty-five million, six hundred forty-three thousand, two hundred sixty-one".