7779897936655 has 16 divisors (see below), whose sum is σ = 10054309515264. Its totient is φ = 5744991075840.

The previous prime is 7779897936641. The next prime is 7779897936659. The reversal of 7779897936655 is 5566397989777.

It is not a de Polignac number, because 7779897936655 - 2²⁷ = 7779763718927 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 (7779897936659) 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, 602215 + ... + 3990295.

It is an arithmetic number, because the mean of its divisors is an integer number (628394344704).

Almost surely, 2^{7779897936655} is an apocalyptic number.

7779897936655 is a deficient number, since it is larger than the sum of its proper divisors (2274411578609).

7779897936655 is a wasteful number, since it uses less digits than its factorization.

7779897936655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423426.

The product of its digits is 37807106400, while the sum is 88.

The spelling of 7779897936655 in words is "seven trillion, seven hundred seventy-nine billion, eight hundred ninety-seven million, nine hundred thirty-six thousand, six hundred fifty-five".