538540225609 has 9 divisors (see below), whose sum is σ = 539859244269. Its totient is φ = 537224427180.

The previous prime is 538540225577. The next prime is 538540225627. The reversal of 538540225609 is 906522045835.

The square root of 538540225609 is 733853.

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

It is not a de Polignac number, because 538540225609 - 2⁵ = 538540225577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538540225669) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 463060662 + ... + 463061824.

Almost surely, 2^538540225609 is an apocalyptic number.

538540225609 is the 733853-rd square number.

538540225609 is the 366927-th centered octagonal number.

It is an amenable number.

538540225609 is a deficient number, since it is larger than the sum of its proper divisors (1319018660).

538540225609 is an frugal number, since it uses more digits than its factorization.

538540225609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588 (or 1794 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 49.

Multiplying 538540225609 by its sum of digits (49), we get a square (26388471054841 = 5136971²).

The spelling of 538540225609 in words is "five hundred thirty-eight billion, five hundred forty million, two hundred twenty-five thousand, six hundred nine".