40405861057 has 8 divisors (see below), whose sum is σ = 40873459880. Its totient is φ = 39940024320.

The previous prime is 40405861043. The next prime is 40405861081. The reversal of 40405861057 is 75016850404.

It can be written as a sum of positive squares in 4 ways, for example, as 100881936 + 40304979121 = 10044^2 + 200761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40405861057 - 2²³ = 40397472449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40405861957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394368 + ... + 486145.

It is an arithmetic number, because the mean of its divisors is an integer number (5109182485).

Almost surely, 2^40405861057 is an apocalyptic number.

It is an amenable number.

40405861057 is a deficient number, since it is larger than the sum of its proper divisors (467598823).

40405861057 is a wasteful number, since it uses less digits than its factorization.

40405861057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881043.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 40405861057 in words is "forty billion, four hundred five million, eight hundred sixty-one thousand, fifty-seven".