40784173081 has 2 divisors, whose sum is σ = 40784173082. Its totient is φ = 40784173080.

The previous prime is 40784173049. The next prime is 40784173093. The reversal of 40784173081 is 18037148704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38753859600 + 2030313481 = 196860^2 + 45059^2 .

It is a cyclic number.

It is not a de Polignac number, because 40784173081 - 2⁵ = 40784173049 is a prime.

It is a super-2 number, since 2×40784173081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40784173021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20392086540 + 20392086541.

It is an arithmetic number, because the mean of its divisors is an integer number (20392086541).

Almost surely, 2^40784173081 is an apocalyptic number.

It is an amenable number.

40784173081 is a deficient number, since it is larger than the sum of its proper divisors (1).

40784173081 is an equidigital number, since it uses as much as digits as its factorization.

40784173081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 40784173081 in words is "forty billion, seven hundred eighty-four million, one hundred seventy-three thousand, eighty-one".