18199706516 has 24 divisors (see below), whose sum is σ = 31949190504. Its totient is φ = 9071406080.

The previous prime is 18199706479. The next prime is 18199706519. The reversal of 18199706516 is 61560799181.

It can be written as a sum of positive squares in 4 ways, for example, as 3369338116 + 14830368400 = 58046^2 + 121780^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18199706519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2195756 + ... + 2204028.

It is an arithmetic number, because the mean of its divisors is an integer number (1331216271).

Almost surely, 2^18199706516 is an apocalyptic number.

It is an amenable number.

18199706516 is a deficient number, since it is larger than the sum of its proper divisors (13749483988).

18199706516 is a wasteful number, since it uses less digits than its factorization.

18199706516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9931 (or 9929 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 18199706516 in words is "eighteen billion, one hundred ninety-nine million, seven hundred six thousand, five hundred sixteen".