40782420557 has 2 divisors, whose sum is σ = 40782420558. Its totient is φ = 40782420556.

The previous prime is 40782420533. The next prime is 40782420599. The reversal of 40782420557 is 75502428704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36687188521 + 4095232036 = 191539^2 + 63994^2 .

It is a cyclic number.

It is not a de Polignac number, because 40782420557 - 2¹⁰ = 40782419533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40782420517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20391210278 + 20391210279.

It is an arithmetic number, because the mean of its divisors is an integer number (20391210279).

Almost surely, 2^40782420557 is an apocalyptic number.

It is an amenable number.

40782420557 is a deficient number, since it is larger than the sum of its proper divisors (1).

40782420557 is an equidigital number, since it uses as much as digits as its factorization.

40782420557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 627200, while the sum is 44.

The spelling of 40782420557 in words is "forty billion, seven hundred eighty-two million, four hundred twenty thousand, five hundred fifty-seven".