40005178490897 has 2 divisors, whose sum is σ = 40005178490898. Its totient is φ = 40005178490896.

The previous prime is 40005178490869. The next prime is 40005178490899. The reversal of 40005178490897 is 79809487150004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24955309989841 + 15049868501056 = 4995529^2 + 3879416^2 .

It is a cyclic number.

It is not a de Polignac number, because 40005178490897 - 2¹⁸ = 40005178228753 is a prime.

Together with 40005178490899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40005178490899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002589245448 + 20002589245449.

It is an arithmetic number, because the mean of its divisors is an integer number (20002589245449).

Almost surely, 2^{40005178490897} is an apocalyptic number.

It is an amenable number.

40005178490897 is a deficient number, since it is larger than the sum of its proper divisors (1).

40005178490897 is an equidigital number, since it uses as much as digits as its factorization.

40005178490897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20321280, while the sum is 62.

The spelling of 40005178490897 in words is "forty trillion, five billion, one hundred seventy-eight million, four hundred ninety thousand, eight hundred ninety-seven".