42010645581 has 24 divisors (see below), whose sum is σ = 62446310784. Its totient is φ = 27201919680.

The previous prime is 42010645577. The next prime is 42010645597. The reversal of 42010645581 is 18554601024.

It is a happy number.

42010645581 is a `hidden beast` number, since 4 + 2 + 0 + 1 + 0 + 645 + 5 + 8 + 1 = 666.

It is not a de Polignac number, because 42010645581 - 2² = 42010645577 is a prime.

It is a super-2 number, since 2×42010645581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42010645511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 323656 + ... + 434481.

It is an arithmetic number, because the mean of its divisors is an integer number (2601929616).

Almost surely, 2^42010645581 is an apocalyptic number.

It is an amenable number.

42010645581 is a deficient number, since it is larger than the sum of its proper divisors (20435665203).

42010645581 is a wasteful number, since it uses less digits than its factorization.

42010645581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758321 (or 758318 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 42010645581 in words is "forty-two billion, ten million, six hundred forty-five thousand, five hundred eighty-one".