40645567 has 2 divisors, whose sum is σ = 40645568. Its totient is φ = 40645566.

The previous prime is 40645543. The next prime is 40645609. The reversal of 40645567 is 76554604.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40645567 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40645537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20322783 + 20322784.

It is an arithmetic number, because the mean of its divisors is an integer number (20322784).

Almost surely, 2^40645567 is an apocalyptic number.

40645567 is a deficient number, since it is larger than the sum of its proper divisors (1).

40645567 is an equidigital number, since it uses as much as digits as its factorization.

40645567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 40645567 is about 6375.3875960603. The cubic root of 40645567 is about 343.8252193740.

The spelling of 40645567 in words is "forty million, six hundred forty-five thousand, five hundred sixty-seven".