61436665 has 4 divisors (see below), whose sum is σ = 73724004. Its totient is φ = 49149328.

The previous prime is 61436663. The next prime is 61436677. The reversal of 61436665 is 56663416.

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 43771456 + 17665209 = 6616^2 + 4203^2 .

It is a cyclic number.

It is not a de Polignac number, because 61436665 - 2¹ = 61436663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61436663) 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, 6143662 + ... + 6143671.

It is an arithmetic number, because the mean of its divisors is an integer number (18431001).

Almost surely, 2^61436665 is an apocalyptic number.

It is an amenable number.

61436665 is a deficient number, since it is larger than the sum of its proper divisors (12287339).

61436665 is a wasteful number, since it uses less digits than its factorization.

61436665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12287338.

The product of its digits is 77760, while the sum is 37.

The square root of 61436665 is about 7838.1544383866. The cubic root of 61436665 is about 394.5867921654.

The spelling of 61436665 in words is "sixty-one million, four hundred thirty-six thousand, six hundred sixty-five".