7877998997787 has 8 divisors (see below), whose sum is σ = 10541115267904. Its totient is φ = 5233441029768.

The previous prime is 7877998997783. The next prime is 7877998997807.

7877998997787 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 7877998997787 - 2² = 7877998997783 is a prime.

It is a super-4 number, since 4×7877998997787⁴ (a number of 53 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7877998997691 and 7877998997700.

It is not an unprimeable number, because it can be changed into a prime (7877998997783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4639574533 + ... + 4639576230.

It is an arithmetic number, because the mean of its divisors is an integer number (1317639408488).

Almost surely, 2^{7877998997787} is an apocalyptic number.

7877998997787 is a deficient number, since it is larger than the sum of its proper divisors (2663116270117).

7877998997787 is a wasteful number, since it uses less digits than its factorization.

7877998997787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9279151049.

The product of its digits is 395210285568, while the sum is 102.

The spelling of 7877998997787 in words is "seven trillion, eight hundred seventy-seven billion, nine hundred ninety-eight million, nine hundred ninety-seven thousand, seven hundred eighty-seven".