61536665 has 4 divisors (see below), whose sum is σ = 73844004. Its totient is φ = 49229328.

The previous prime is 61536659. The next prime is 61536667. The reversal of 61536665 is 56663516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26050816 + 35485849 = 5104^2 + 5957^2 .

It is a cyclic number.

It is not a de Polignac number, because 61536665 - 2¹⁶ = 61471129 is a prime.

It is a super-2 number, since 2×61536665² = 7573522278644450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61536667) 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, 6153662 + ... + 6153671.

It is an arithmetic number, because the mean of its divisors is an integer number (18461001).

Almost surely, 2^61536665 is an apocalyptic number.

It is an amenable number.

61536665 is a deficient number, since it is larger than the sum of its proper divisors (12307339).

61536665 is a wasteful number, since it uses less digits than its factorization.

61536665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12307338.

The product of its digits is 97200, while the sum is 38.

The square root of 61536665 is about 7844.5308973832. The cubic root of 61536665 is about 394.8007647700.

The spelling of 61536665 in words is "sixty-one million, five hundred thirty-six thousand, six hundred sixty-five".