40016555261 has 2 divisors, whose sum is σ = 40016555262. Its totient is φ = 40016555260.

The previous prime is 40016555239. The next prime is 40016555269. The reversal of 40016555261 is 16255561004.

40016555261 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., 34920023161 + 5096532100 = 186869^2 + 71390^2 .

It is a cyclic number.

It is not a de Polignac number, because 40016555261 - 2¹⁸ = 40016293117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40016555269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20008277630 + 20008277631.

It is an arithmetic number, because the mean of its divisors is an integer number (20008277631).

Almost surely, 2^40016555261 is an apocalyptic number.

It is an amenable number.

40016555261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40016555261 is an equidigital number, since it uses as much as digits as its factorization.

40016555261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 40016555261 in words is "forty billion, sixteen million, five hundred fifty-five thousand, two hundred sixty-one".