7781770113 has 24 divisors (see below), whose sum is σ = 11723723712. Its totient is φ = 4580566848.

The previous prime is 7781770109. The next prime is 7781770147. The reversal of 7781770113 is 3110771877.

It is not a de Polignac number, because 7781770113 - 2² = 7781770109 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7781770163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322006 + ... + 345327.

It is an arithmetic number, because the mean of its divisors is an integer number (488488488).

Almost surely, 2^7781770113 is an apocalyptic number.

It is an amenable number.

7781770113 is a deficient number, since it is larger than the sum of its proper divisors (3941953599).

7781770113 is a wasteful number, since it uses less digits than its factorization.

7781770113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667385 (or 667372 counting only the distinct ones).

The product of its (nonzero) digits is 57624, while the sum is 42.

The square root of 7781770113 is about 88214.3418781776. The cubic root of 7781770113 is about 1981.6462614434.

The spelling of 7781770113 in words is "seven billion, seven hundred eighty-one million, seven hundred seventy thousand, one hundred thirteen".