61662565 has 24 divisors (see below), whose sum is σ = 78574104. Its totient is φ = 46425600.

The previous prime is 61662551. The next prime is 61662569. The reversal of 61662565 is 56526616.

It can be written as a sum of positive squares in 4 ways, for example, as 5846724 + 55815841 = 2418^2 + 7471^2 .

It is not a de Polignac number, because 61662565 - 2⁵ = 61662533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61662569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196849 + ... + 197161.

It is an arithmetic number, because the mean of its divisors is an integer number (3273921).

Almost surely, 2^61662565 is an apocalyptic number.

It is an amenable number.

61662565 is a deficient number, since it is larger than the sum of its proper divisors (16911539).

61662565 is a wasteful number, since it uses less digits than its factorization.

61662565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 390 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 61662565 is about 7852.5514961699. The cubic root of 61662565 is about 395.0698268907.

The spelling of 61662565 in words is "sixty-one million, six hundred sixty-two thousand, five hundred sixty-five".