40005178490869 has 2 divisors, whose sum is σ = 40005178490870. Its totient is φ = 40005178490868.

The previous prime is 40005178490831. The next prime is 40005178490897. The reversal of 40005178490869 is 96809487150004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30549166036900 + 9456012453969 = 5527130^2 + 3075063^2 .

It is a cyclic number.

It is not a de Polignac number, because 40005178490869 - 2³⁷ = 39867739537397 is a prime.

It is a super-2 number, since 2×40005178490869² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002589245434 + 20002589245435.

It is an arithmetic number, because the mean of its divisors is an integer number (20002589245435).

Almost surely, 2^{40005178490869} is an apocalyptic number.

It is an amenable number.

40005178490869 is a deficient number, since it is larger than the sum of its proper divisors (1).

40005178490869 is an equidigital number, since it uses as much as digits as its factorization.

40005178490869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 40005178490869 in words is "forty trillion, five billion, one hundred seventy-eight million, four hundred ninety thousand, eight hundred sixty-nine".