42745639145 has 24 divisors (see below), whose sum is σ = 56432692680. Its totient is φ = 31059705600.

The previous prime is 42745639141. The next prime is 42745639147. The reversal of 42745639145 is 54193654724.

It can be written as a sum of positive squares in 4 ways, for example, as 7545875689 + 35199763456 = 86867^2 + 187616^2 .

It is not a de Polignac number, because 42745639145 - 2² = 42745639141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42745639093 and 42745639102.

It is not an unprimeable number, because it can be changed into a prime (42745639141) 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, 651755 + ... + 714335.

It is an arithmetic number, because the mean of its divisors is an integer number (2351362195).

Almost surely, 2^42745639145 is an apocalyptic number.

It is an amenable number.

42745639145 is a deficient number, since it is larger than the sum of its proper divisors (13687053535).

42745639145 is a wasteful number, since it uses less digits than its factorization.

42745639145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63737 (or 63726 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 50.

The spelling of 42745639145 in words is "forty-two billion, seven hundred forty-five million, six hundred thirty-nine thousand, one hundred forty-five".