7788992887955 has 4 divisors (see below), whose sum is σ = 9346791465552. Its totient is φ = 6231194310360.

The previous prime is 7788992887891. The next prime is 7788992888081. The reversal of 7788992887955 is 5597882998877.

It is a happy number.

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

It is not a de Polignac number, because 7788992887955 - 2⁶ = 7788992887891 is a prime.

It is a super-2 number, since 2×7788992887955² (a number of 27 digits) contains 22 as substring.

It is a Duffinian 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, 778899288791 + ... + 778899288800.

It is an arithmetic number, because the mean of its divisors is an integer number (2336697866388).

Almost surely, 2^{7788992887955} is an apocalyptic number.

7788992887955 is a deficient number, since it is larger than the sum of its proper divisors (1557798577597).

7788992887955 is a wasteful number, since it uses less digits than its factorization.

7788992887955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557798577596.

The product of its digits is 51209625600, while the sum is 92.

The spelling of 7788992887955 in words is "seven trillion, seven hundred eighty-eight billion, nine hundred ninety-two million, eight hundred eighty-seven thousand, nine hundred fifty-five".