42187537225 has 18 divisors (see below), whose sum is σ = 53449330574. Its totient is φ = 33031900800.

The previous prime is 42187537213. The next prime is 42187537247. The reversal of 42187537225 is 52273578124.

42187537225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 4891044096 + 37296493129 = 69936^2 + 193123^2 .

It is a de Polignac number, because none of the positive numbers 2^k-42187537225 is a prime.

It is a super-2 number, since 2×42187537225² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 326736 + ... + 437185.

Almost surely, 2^42187537225 is an apocalyptic number.

It is an amenable number.

42187537225 is a deficient number, since it is larger than the sum of its proper divisors (11261793349).

42187537225 is an equidigital number, since it uses as much as digits as its factorization.

42187537225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764025 (or 763973 counting only the distinct ones).

The product of its digits is 940800, while the sum is 46.

The spelling of 42187537225 in words is "forty-two billion, one hundred eighty-seven million, five hundred thirty-seven thousand, two hundred twenty-five".