18710855797 has 8 divisors (see below), whose sum is σ = 18750022040. Its totient is φ = 18671731200.

The previous prime is 18710855773. The next prime is 18710855819. The reversal of 18710855797 is 79755801781.

It can be written as a sum of positive squares in 4 ways, for example, as 585349636 + 18125506161 = 24194^2 + 134631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18710855797 - 2³¹ = 16563372149 is a prime.

It is a super-2 number, since 2×18710855797² (a number of 21 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 (18710855297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 986233 + ... + 1005025.

It is an arithmetic number, because the mean of its divisors is an integer number (2343752755).

Almost surely, 2^18710855797 is an apocalyptic number.

It is an amenable number.

18710855797 is a deficient number, since it is larger than the sum of its proper divisors (39166243).

18710855797 is a wasteful number, since it uses less digits than its factorization.

18710855797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20823.

The product of its (nonzero) digits is 4939200, while the sum is 58.

The spelling of 18710855797 in words is "eighteen billion, seven hundred ten million, eight hundred fifty-five thousand, seven hundred ninety-seven".