12554078665 has 8 divisors (see below), whose sum is σ = 15066471240. Its totient is φ = 10042211712.

The previous prime is 12554078659. The next prime is 12554078671. The reversal of 12554078665 is 56687045521.

It is an interprime number because it is at equal distance from previous prime (12554078659) and next prime (12554078671).

It can be written as a sum of positive squares in 4 ways, for example, as 371217289 + 12182861376 = 19267^2 + 110376^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12554078665 - 2²¹ = 12551981513 is a prime.

It is a super-2 number, since 2×12554078665² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76794 + ... + 176083.

It is an arithmetic number, because the mean of its divisors is an integer number (1883308905).

Almost surely, 2^12554078665 is an apocalyptic number.

It is an amenable number.

12554078665 is a deficient number, since it is larger than the sum of its proper divisors (2512392575).

12554078665 is an equidigital number, since it uses as much as digits as its factorization.

12554078665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262811.

The product of its (nonzero) digits is 2016000, while the sum is 49.

The spelling of 12554078665 in words is "twelve billion, five hundred fifty-four million, seventy-eight thousand, six hundred sixty-five".