40866585142581 has 80 divisors (see below), whose sum is σ = 70571381760000. Its totient is φ = 23292033822720.

The previous prime is 40866585142549. The next prime is 40866585142589. The reversal of 40866585142581 is 18524158566804.

40866585142581 is a `hidden beast` number, since 4 + 0 + 8 + 6 + 6 + 5 + 8 + 5 + 1 + 42 + 581 = 666.

It is not a de Polignac number, because 40866585142581 - 2⁵ = 40866585142549 is a prime.

It is a super-2 number, since 2×40866585142581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40866585142589) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 17838540 + ... + 19998666.

It is an arithmetic number, because the mean of its divisors is an integer number (882142272000).

Almost surely, 2^{40866585142581} is an apocalyptic number.

It is an amenable number.

40866585142581 is a deficient number, since it is larger than the sum of its proper divisors (29704796617419).

40866585142581 is a wasteful number, since it uses less digits than its factorization.

40866585142581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161416 (or 2161407 counting only the distinct ones).

The product of its (nonzero) digits is 73728000, while the sum is 63.

The spelling of 40866585142581 in words is "forty trillion, eight hundred sixty-six billion, five hundred eighty-five million, one hundred forty-two thousand, five hundred eighty-one".