40036400647261 has 2 divisors, whose sum is σ = 40036400647262. Its totient is φ = 40036400647260.

The previous prime is 40036400647213. The next prime is 40036400647381. The reversal of 40036400647261 is 16274600463004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21779666263161 + 18256734384100 = 4666869^2 + 4272790^2 .

It is a cyclic number.

It is not a de Polignac number, because 40036400647261 - 2³⁹ = 39486644833373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40036400617261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20018200323630 + 20018200323631.

It is an arithmetic number, because the mean of its divisors is an integer number (20018200323631).

Almost surely, 2^{40036400647261} is an apocalyptic number.

It is an amenable number.

40036400647261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40036400647261 is an equidigital number, since it uses as much as digits as its factorization.

40036400647261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 43.

The spelling of 40036400647261 in words is "forty trillion, thirty-six billion, four hundred million, six hundred forty-seven thousand, two hundred sixty-one".