40495661 has 2 divisors, whose sum is σ = 40495662. Its totient is φ = 40495660.

The previous prime is 40495639. The next prime is 40495681. The reversal of 40495661 is 16659404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33709636 + 6786025 = 5806^2 + 2605^2 .

It is a cyclic number.

It is not a de Polignac number, because 40495661 - 2⁶ = 40495597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40495681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20247830 + 20247831.

It is an arithmetic number, because the mean of its divisors is an integer number (20247831).

Almost surely, 2^40495661 is an apocalyptic number.

It is an amenable number.

40495661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40495661 is an equidigital number, since it uses as much as digits as its factorization.

40495661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 40495661 is about 6363.6201175117. The cubic root of 40495661 is about 343.4020083401.

The spelling of 40495661 in words is "forty million, four hundred ninety-five thousand, six hundred sixty-one".