18499426801216 has 21 divisors (see below), whose sum is σ = 36709868338689. Its totient is φ = 9249696196224.

The previous prime is 18499426801187. The next prime is 18499426801267. The reversal of 18499426801216 is 61210862499481.

The square root of 18499426801216 is 4301096.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1657398760000 + 16842028041216 = 1287400^2 + 4103904^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 34139950 + ... + 34677586.

It is an arithmetic number, because the mean of its divisors is an integer number (1748088968509).

Almost surely, 2^{18499426801216} is an apocalyptic number.

18499426801216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18499426801216 is the 4301096-th square number.

It is an amenable number.

18499426801216 is a deficient number, since it is larger than the sum of its proper divisors (18210441537473).

18499426801216 is an frugal number, since it uses more digits than its factorization.

18499426801216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075286 (or 537639 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 18499426801216 in words is "eighteen trillion, four hundred ninety-nine billion, four hundred twenty-six million, eight hundred one thousand, two hundred sixteen".