40533978257 has 2 divisors, whose sum is σ = 40533978258. Its totient is φ = 40533978256.

The previous prime is 40533978209. The next prime is 40533978283. The reversal of 40533978257 is 75287933504.

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., 38557642321 + 1976335936 = 196361^2 + 44456^2 .

It is a cyclic number.

It is not a de Polignac number, because 40533978257 - 2¹² = 40533974161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40533978199 and 40533978208.

It is not a weakly prime, because it can be changed into another prime (40533978557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20266989128 + 20266989129.

It is an arithmetic number, because the mean of its divisors is an integer number (20266989129).

Almost surely, 2^40533978257 is an apocalyptic number.

It is an amenable number.

40533978257 is a deficient number, since it is larger than the sum of its proper divisors (1).

40533978257 is an equidigital number, since it uses as much as digits as its factorization.

40533978257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 40533978257 in words is "forty billion, five hundred thirty-three million, nine hundred seventy-eight thousand, two hundred fifty-seven".