40505517961 has 2 divisors, whose sum is σ = 40505517962. Its totient is φ = 40505517960.

The previous prime is 40505517911. The next prime is 40505517979. The reversal of 40505517961 is 16971550504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28244163600 + 12261354361 = 168060^2 + 110731^2 .

It is a cyclic number.

It is not a de Polignac number, because 40505517961 - 2¹³ = 40505509769 is a prime.

It is not a weakly prime, because it can be changed into another prime (40505517911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20252758980 + 20252758981.

It is an arithmetic number, because the mean of its divisors is an integer number (20252758981).

Almost surely, 2^40505517961 is an apocalyptic number.

It is an amenable number.

40505517961 is a deficient number, since it is larger than the sum of its proper divisors (1).

40505517961 is an equidigital number, since it uses as much as digits as its factorization.

40505517961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 40505517961 in words is "forty billion, five hundred five million, five hundred seventeen thousand, nine hundred sixty-one".