40201517861 has 2 divisors, whose sum is σ = 40201517862. Its totient is φ = 40201517860.

The previous prime is 40201517827. The next prime is 40201517869. The reversal of 40201517861 is 16871510204.

40201517861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33655737025 + 6545780836 = 183455^2 + 80906^2 .

It is a cyclic number.

It is not a de Polignac number, because 40201517861 - 2²⁶ = 40134408997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40201517869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20100758930 + 20100758931.

It is an arithmetic number, because the mean of its divisors is an integer number (20100758931).

Almost surely, 2^40201517861 is an apocalyptic number.

It is an amenable number.

40201517861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40201517861 is an equidigital number, since it uses as much as digits as its factorization.

40201517861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 40201517861 in words is "forty billion, two hundred one million, five hundred seventeen thousand, eight hundred sixty-one".