18161262752 has 12 divisors (see below), whose sum is σ = 35754986106. Its totient is φ = 9080631360.

The previous prime is 18161262719. The next prime is 18161262793. The reversal of 18161262752 is 25726216181.

It can be written as a sum of positive squares in only one way, i.e., 17743305616 + 417957136 = 133204^2 + 20444^2 .

It is a super-2 number, since 2×18161262752² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283769699 + ... + 283769762.

Almost surely, 2^18161262752 is an apocalyptic number.

It is an amenable number.

18161262752 is a deficient number, since it is larger than the sum of its proper divisors (17593723354).

18161262752 is an equidigital number, since it uses as much as digits as its factorization.

18161262752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567539471 (or 567539463 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The spelling of 18161262752 in words is "eighteen billion, one hundred sixty-one million, two hundred sixty-two thousand, seven hundred fifty-two".