40205400253517 has 2 divisors, whose sum is σ = 40205400253518. Its totient is φ = 40205400253516.

The previous prime is 40205400253439. The next prime is 40205400253541. The reversal of 40205400253517 is 71535200450204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34429328257801 + 5776071995716 = 5867651^2 + 2403346^2 .

It is a cyclic number.

It is not a de Polignac number, because 40205400253517 - 2²⁰ = 40205399204941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40205400253817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20102700126758 + 20102700126759.

It is an arithmetic number, because the mean of its divisors is an integer number (20102700126759).

Almost surely, 2^{40205400253517} is an apocalyptic number.

It is an amenable number.

40205400253517 is a deficient number, since it is larger than the sum of its proper divisors (1).

40205400253517 is an equidigital number, since it uses as much as digits as its factorization.

40205400253517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168000, while the sum is 38.

The spelling of 40205400253517 in words is "forty trillion, two hundred five billion, four hundred million, two hundred fifty-three thousand, five hundred seventeen".