12280778065 has 16 divisors (see below), whose sum is σ = 15102142848. Its totient is φ = 9583998336.

The previous prime is 12280778063. The next prime is 12280778099. The reversal of 12280778065 is 56087708221.

It is a cyclic number.

It is not a de Polignac number, because 12280778065 - 2¹ = 12280778063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12280778063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143452 + ... + 212461.

It is an arithmetic number, because the mean of its divisors is an integer number (943883928).

Almost surely, 2^12280778065 is an apocalyptic number.

It is an amenable number.

12280778065 is a deficient number, since it is larger than the sum of its proper divisors (2821364783).

12280778065 is a wasteful number, since it uses less digits than its factorization.

12280778065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356088.

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 12280778065 in words is "twelve billion, two hundred eighty million, seven hundred seventy-eight thousand, sixty-five".