61885665 has 12 divisors (see below), whose sum is σ = 107268564. Its totient is φ = 33005664.

The previous prime is 61885651. The next prime is 61885673. The reversal of 61885665 is 56658816.

61885665 is a `hidden beast` number, since 6 + 1 + 88 + 566 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8785296 + 53100369 = 2964^2 + 7287^2 .

It is not a de Polignac number, because 61885665 - 2⁵ = 61885633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1375237 = 61885665 / (6 + 1 + 8 + 8 + 5 + 6 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 61885665.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 687574 + ... + 687663.

It is an arithmetic number, because the mean of its divisors is an integer number (8939047).

Almost surely, 2^61885665 is an apocalyptic number.

It is an amenable number.

61885665 is a deficient number, since it is larger than the sum of its proper divisors (45382899).

61885665 is a wasteful number, since it uses less digits than its factorization.

61885665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375248 (or 1375245 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 61885665 is about 7866.7442439678. The cubic root of 61885665 is about 395.5457179616.

The spelling of 61885665 in words is "sixty-one million, eight hundred eighty-five thousand, six hundred sixty-five".