40608661 has 2 divisors, whose sum is σ = 40608662. Its totient is φ = 40608660.

The previous prime is 40608649. The next prime is 40608691. The reversal of 40608661 is 16680604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28836900 + 11771761 = 5370^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 40608661 - 2⁵ = 40608629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40608691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20304330 + 20304331.

It is an arithmetic number, because the mean of its divisors is an integer number (20304331).

Almost surely, 2^40608661 is an apocalyptic number.

It is an amenable number.

40608661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40608661 is an equidigital number, since it uses as much as digits as its factorization.

40608661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40608661 is about 6372.4925264766. The cubic root of 40608661 is about 343.7211239215.

It can be divided in two parts, 4060 and 8661, that added together give a palindrome (12721).

The spelling of 40608661 in words is "forty million, six hundred eight thousand, six hundred sixty-one".