40661365 has 16 divisors (see below), whose sum is σ = 52379568. Its totient is φ = 30191616.

The previous prime is 40661363. The next prime is 40661371. The reversal of 40661365 is 56316604.

It can be written as a sum of positive squares in 8 ways, for example, as 33489 + 40627876 = 183^2 + 6374^2 .

It is a cyclic number.

It is not a de Polignac number, because 40661365 - 2¹ = 40661363 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 (40661363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2929 + ... + 9481.

It is an arithmetic number, because the mean of its divisors is an integer number (3273723).

Almost surely, 2^40661365 is an apocalyptic number.

It is an amenable number.

40661365 is a deficient number, since it is larger than the sum of its proper divisors (11718203).

40661365 is a wasteful number, since it uses less digits than its factorization.

40661365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6648.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 40661365 is about 6376.6264591867. The cubic root of 40661365 is about 343.8697592639.

Adding to 40661365 its reverse (56316604), we get a palindrome (96977969).

The spelling of 40661365 in words is "forty million, six hundred sixty-one thousand, three hundred sixty-five".