1081720477823 has 2 divisors, whose sum is σ = 1081720477824. Its totient is φ = 1081720477822.

The previous prime is 1081720477757. The next prime is 1081720477907. The reversal of 1081720477823 is 3287740271801.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1081720477823 - 2²⁸ = 1081452042367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081720477223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540860238911 + 540860238912.

It is an arithmetic number, because the mean of its divisors is an integer number (540860238912).

Almost surely, 2^{1081720477823} is an apocalyptic number.

1081720477823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081720477823 is an equidigital number, since it uses as much as digits as its factorization.

1081720477823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1053696, while the sum is 50.

The spelling of 1081720477823 in words is "one trillion, eighty-one billion, seven hundred twenty million, four hundred seventy-seven thousand, eight hundred twenty-three".