18726554025 has 45 divisors (see below), whose sum is σ = 34699461973. Its totient is φ = 9984211200.

The previous prime is 18726554003. The next prime is 18726554081. The reversal of 18726554025 is 52045562781.

The square root of 18726554025 is 136845.

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

18726554025 is a `hidden beast` number, since 1 + 8 + 72 + 6 + 554 + 0 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4277552409 + 14449001616 = 65403^2 + 120204^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 18726554025 - 2⁹ = 18726553513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6156505 + ... + 6159545.

Almost surely, 2^18726554025 is an apocalyptic number.

18726554025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18726554025 is the 136845-th square number.

18726554025 is the 68423-rd centered octagonal number.

It is an amenable number.

18726554025 is a deficient number, since it is larger than the sum of its proper divisors (15972907948).

18726554025 is an frugal number, since it uses more digits than its factorization.

18726554025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104 (or 3049 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 18726554025 in words is "eighteen billion, seven hundred twenty-six million, five hundred fifty-four thousand, twenty-five".