248478137909 has 8 divisors (see below), whose sum is σ = 253186025400. Its totient is φ = 243770977216.

The previous prime is 248478137903. The next prime is 248478137911. The reversal of 248478137909 is 909731874842.

It can be written as a sum of positive squares in 4 ways, for example, as 62661103684 + 185817034225 = 250322^2 + 431065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248478137909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248478137903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535067 + ... + 885015.

It is an arithmetic number, because the mean of its divisors is an integer number (31648253175).

Almost surely, 2^248478137909 is an apocalyptic number.

It is an amenable number.

248478137909 is a deficient number, since it is larger than the sum of its proper divisors (4707887491).

248478137909 is a wasteful number, since it uses less digits than its factorization.

248478137909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363399.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 248478137909 in words is "two hundred forty-eight billion, four hundred seventy-eight million, one hundred thirty-seven thousand, nine hundred nine".