61671825 has 36 divisors (see below), whose sum is σ = 112137168. Its totient is φ = 32392800.

The previous prime is 61671823. The next prime is 61671829. The reversal of 61671825 is 52817616.

61671825 is a `hidden beast` number, since 616 + 7 + 18 + 25 = 666.

It is not a de Polignac number, because 61671825 - 2¹ = 61671823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61671825.

It is not an unprimeable number, because it can be changed into a prime (61671821) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13030 + ... + 17120.

Almost surely, 2^61671825 is an apocalyptic number.

It is an amenable number.

61671825 is a deficient number, since it is larger than the sum of its proper divisors (50465343).

61671825 is a wasteful number, since it uses less digits than its factorization.

61671825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4174 (or 4166 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 61671825 is about 7853.1410913086. The cubic root of 61671825 is about 395.0896020626.

The spelling of 61671825 in words is "sixty-one million, six hundred seventy-one thousand, eight hundred twenty-five".