40547428517581 has 2 divisors, whose sum is σ = 40547428517582. Its totient is φ = 40547428517580.

The previous prime is 40547428517567. The next prime is 40547428517681. The reversal of 40547428517581 is 18571582474504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22370345872900 + 18177082644681 = 4729730^2 + 4263459^2 .

It is a cyclic number.

It is not a de Polignac number, because 40547428517581 - 2¹¹ = 40547428515533 is a prime.

It is a super-2 number, since 2×40547428517581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40547428517381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20273714258790 + 20273714258791.

It is an arithmetic number, because the mean of its divisors is an integer number (20273714258791).

Almost surely, 2^{40547428517581} is an apocalyptic number.

It is an amenable number.

40547428517581 is a deficient number, since it is larger than the sum of its proper divisors (1).

40547428517581 is an equidigital number, since it uses as much as digits as its factorization.

40547428517581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50176000, while the sum is 61.

The spelling of 40547428517581 in words is "forty trillion, five hundred forty-seven billion, four hundred twenty-eight million, five hundred seventeen thousand, five hundred eighty-one".