1081761782261 has 4 divisors (see below), whose sum is σ = 1082446876800. Its totient is φ = 1081076687724.

The previous prime is 1081761782237. The next prime is 1081761782291. The reversal of 1081761782261 is 1622871671801.

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 1081761782261 - 2¹⁰ = 1081761781237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081761782291) 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, 342544901 + ... + 342548058.

It is an arithmetic number, because the mean of its divisors is an integer number (270611719200).

Almost surely, 2^{1081761782261} is an apocalyptic number.

It is an amenable number.

1081761782261 is a deficient number, since it is larger than the sum of its proper divisors (685094539).

1081761782261 is an equidigital number, since it uses as much as digits as its factorization.

1081761782261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685094538.

The product of its (nonzero) digits is 451584, while the sum is 50.

The spelling of 1081761782261 in words is "one trillion, eighty-one billion, seven hundred sixty-one million, seven hundred eighty-two thousand, two hundred sixty-one".