18100387347025 has 9 divisors (see below), whose sum is σ = 22444506687963. Its totient is φ = 14480292859800.

The previous prime is 18100387346963. The next prime is 18100387347037. The reversal of 18100387347025 is 52074378300181.

It is a happy number.

The square root of 18100387347025 is 4254455.

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., 6516139444929 + 11584247902096 = 2552673^2 + 3403564^2 .

It is not a de Polignac number, because 18100387347025 - 2⁹ = 18100387346513 is a prime.

It is a super-2 number, since 2×18100387347025² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18100387347025.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20846830 + ... + 21697720.

Almost surely, 2^{18100387347025} is an apocalyptic number.

18100387347025 is the 4254455-th square number.

18100387347025 is the 2127228-th centered octagonal number.

It is an amenable number.

18100387347025 is a deficient number, since it is larger than the sum of its proper divisors (4344119340938).

18100387347025 is an frugal number, since it uses more digits than its factorization.

18100387347025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701792 (or 850896 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

Multiplying 18100387347025 by its sum of digits (49), we get a square (886918980004225 = 29781185²).

The spelling of 18100387347025 in words is "eighteen trillion, one hundred billion, three hundred eighty-seven million, three hundred forty-seven thousand, twenty-five".