10780901991 has 12 divisors (see below), whose sum is σ = 15579252832. Its totient is φ = 7184111616.

The previous prime is 10780901977. The next prime is 10780902029. The reversal of 10780901991 is 19910908701.

It is not a de Polignac number, because 10780901991 - 2⁹ = 10780901479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10780901921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241306 + ... + 282471.

Almost surely, 2^10780901991 is an apocalyptic number.

10780901991 is a deficient number, since it is larger than the sum of its proper divisors (4798350841).

10780901991 is a wasteful number, since it uses less digits than its factorization.

10780901991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526070 (or 526067 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 45.

The spelling of 10780901991 in words is "ten billion, seven hundred eighty million, nine hundred one thousand, nine hundred ninety-one".