6617663278255 has 4 divisors (see below), whose sum is σ = 7941195933912. Its totient is φ = 5294130622600.

The previous prime is 6617663278229. The next prime is 6617663278307. The reversal of 6617663278255 is 5528723667166.

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

It is not a de Polignac number, because 6617663278255 - 2¹³ = 6617663270063 is a prime.

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, 661766327821 + ... + 661766327830.

It is an arithmetic number, because the mean of its divisors is an integer number (1985298983478).

Almost surely, 2^{6617663278255} is an apocalyptic number.

6617663278255 is a deficient number, since it is larger than the sum of its proper divisors (1323532655657).

6617663278255 is a wasteful number, since it uses less digits than its factorization.

6617663278255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323532655656.

The product of its digits is 152409600, while the sum is 64.

The spelling of 6617663278255 in words is "six trillion, six hundred seventeen billion, six hundred sixty-three million, two hundred seventy-eight thousand, two hundred fifty-five".