40807661 has 2 divisors, whose sum is σ = 40807662. Its totient is φ = 40807660.

The previous prime is 40807651. The next prime is 40807693. The reversal of 40807661 is 16670804.

It is an a-pointer prime, because the next prime (40807693) can be obtained adding 40807661 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 12823561 = 5290^2 + 3581^2 .

It is a cyclic number.

It is not a de Polignac number, because 40807661 - 2¹⁰ = 40806637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40807601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20403830 + 20403831.

It is an arithmetic number, because the mean of its divisors is an integer number (20403831).

Almost surely, 2^40807661 is an apocalyptic number.

It is an amenable number.

40807661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40807661 is an equidigital number, since it uses as much as digits as its factorization.

40807661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 40807661 is about 6388.0874289571. The cubic root of 40807661 is about 344.2816699929.

The spelling of 40807661 in words is "forty million, eight hundred seven thousand, six hundred sixty-one".