40001642557 has 2 divisors, whose sum is σ = 40001642558. Its totient is φ = 40001642556.

The previous prime is 40001642441. The next prime is 40001642633. The reversal of 40001642557 is 75524610004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27708598681 + 12293043876 = 166459^2 + 110874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40001642557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40001642257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000821278 + 20000821279.

It is an arithmetic number, because the mean of its divisors is an integer number (20000821279).

Almost surely, 2^40001642557 is an apocalyptic number.

It is an amenable number.

40001642557 is a deficient number, since it is larger than the sum of its proper divisors (1).

40001642557 is an equidigital number, since it uses as much as digits as its factorization.

40001642557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 40001642557 in words is "forty billion, one million, six hundred forty-two thousand, five hundred fifty-seven".