42187257065 has 4 divisors (see below), whose sum is σ = 50624708484. Its totient is φ = 33749805648.

The previous prime is 42187257023. The next prime is 42187257067. The reversal of 42187257065 is 56075278124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24375952384 + 17811304681 = 156128^2 + 133459^2 .

It is a cyclic number.

It is not a de Polignac number, because 42187257065 - 2²⁶ = 42120148201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42187257067) 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 3 ways as a sum of consecutive naturals, for example, 4218725702 + ... + 4218725711.

It is an arithmetic number, because the mean of its divisors is an integer number (12656177121).

Almost surely, 2^42187257065 is an apocalyptic number.

It is an amenable number.

42187257065 is a deficient number, since it is larger than the sum of its proper divisors (8437451419).

42187257065 is an equidigital number, since it uses as much as digits as its factorization.

42187257065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8437451418.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 42187257065 in words is "forty-two billion, one hundred eighty-seven million, two hundred fifty-seven thousand, sixty-five".