42891187625 has 48 divisors (see below), whose sum is σ = 63362981136. Its totient is φ = 28793952000.

The previous prime is 42891187621. The next prime is 42891187631. The reversal of 42891187625 is 52678119824.

It can be written as a sum of positive squares in 8 ways, for example, as 14728977769 + 28162209856 = 121363^2 + 167816^2 .

It is not a de Polignac number, because 42891187625 - 2² = 42891187621 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42891187621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87557 + ... + 305693.

It is an arithmetic number, because the mean of its divisors is an integer number (1320062107).

Almost surely, 2^42891187625 is an apocalyptic number.

It is an amenable number.

42891187625 is a deficient number, since it is larger than the sum of its proper divisors (20471793511).

42891187625 is a wasteful number, since it uses less digits than its factorization.

42891187625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218187 (or 218166 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 53.

The spelling of 42891187625 in words is "forty-two billion, eight hundred ninety-one million, one hundred eighty-seven thousand, six hundred twenty-five".