225646220531 has 4 divisors (see below), whose sum is σ = 225656320464. Its totient is φ = 225636120600.

The previous prime is 225646220507. The next prime is 225646220551. The reversal of 225646220531 is 135022646522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135022646522 = 2 ⋅67511323261.

It is a cyclic number.

It is not a de Polignac number, because 225646220531 - 2⁶ = 225646220467 is a prime.

It is a super-2 number, since 2×225646220531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225646220551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5016380 + ... + 5061161.

It is an arithmetic number, because the mean of its divisors is an integer number (56414080116).

Almost surely, 2^225646220531 is an apocalyptic number.

225646220531 is a deficient number, since it is larger than the sum of its proper divisors (10099933).

225646220531 is a wasteful number, since it uses less digits than its factorization.

225646220531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10099932.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 225646220531 in words is "two hundred twenty-five billion, six hundred forty-six million, two hundred twenty thousand, five hundred thirty-one".