61645225 has 12 divisors (see below), whose sum is σ = 76830400. Its totient is φ = 49064400.

The previous prime is 61645223. The next prime is 61645231. The reversal of 61645225 is 52254616.

61645225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61645225 - 2¹ = 61645223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61645223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1221 + ... + 11170.

Almost surely, 2^61645225 is an apocalyptic number.

It is an amenable number.

61645225 is a deficient number, since it is larger than the sum of its proper divisors (15185175).

61645225 is a wasteful number, since it uses less digits than its factorization.

61645225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12600 (or 12595 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 61645225 is about 7851.4473188069. The cubic root of 61645225 is about 395.0327911676.

The spelling of 61645225 in words is "sixty-one million, six hundred forty-five thousand, two hundred twenty-five".