245178280565 has 4 divisors (see below), whose sum is σ = 294213936684. Its totient is φ = 196142624448.

The previous prime is 245178280553. The next prime is 245178280603. The reversal of 245178280565 is 565082871542.

It is a happy number.

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 114824066449 + 130354214116 = 338857^2 + 361046^2 .

It is a cyclic number.

It is not a de Polignac number, because 245178280565 - 2⁸ = 245178280309 is a prime.

It is a super-2 number, since 2×245178280565² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24517828052 + ... + 24517828061.

It is an arithmetic number, because the mean of its divisors is an integer number (73553484171).

Almost surely, 2^245178280565 is an apocalyptic number.

It is an amenable number.

245178280565 is a deficient number, since it is larger than the sum of its proper divisors (49035656119).

245178280565 is an equidigital number, since it uses as much as digits as its factorization.

245178280565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49035656118.

The product of its (nonzero) digits is 5376000, while the sum is 53.

The spelling of 245178280565 in words is "two hundred forty-five billion, one hundred seventy-eight million, two hundred eighty thousand, five hundred sixty-five".