6779920255515 has 48 divisors (see below), whose sum is σ = 13494960910080. Its totient is φ = 3114221739840.

The previous prime is 6779920255501. The next prime is 6779920255597. The reversal of 6779920255515 is 5155520299776.

6779920255515 is a `hidden beast` number, since 6 + 7 + 7 + 9 + 92 + 0 + 25 + 5 + 515 = 666.

It is not a de Polignac number, because 6779920255515 - 2²³ = 6779911866907 is a prime.

It is a super-2 number, since 2×6779920255515² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 360432927 + ... + 360451736.

It is an arithmetic number, because the mean of its divisors is an integer number (281145018960).

Almost surely, 2^{6779920255515} is an apocalyptic number.

6779920255515 is a deficient number, since it is larger than the sum of its proper divisors (6715040654565).

6779920255515 is a wasteful number, since it uses less digits than its factorization.

6779920255515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720884704 (or 720884701 counting only the distinct ones).

The product of its (nonzero) digits is 59535000, while the sum is 63.

The spelling of 6779920255515 in words is "six trillion, seven hundred seventy-nine billion, nine hundred twenty million, two hundred fifty-five thousand, five hundred fifteen".