7977520247798 has 8 divisors (see below), whose sum is σ = 12486553431408. Its totient is φ = 3815335770664.

The previous prime is 7977520247797. The next prime is 7977520247803. The reversal of 7977520247798 is 8977420257797.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7977520247797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86712176561 + ... + 86712176652.

It is an arithmetic number, because the mean of its divisors is an integer number (1560819178926).

Almost surely, 2^{7977520247798} is an apocalyptic number.

7977520247798 is a deficient number, since it is larger than the sum of its proper divisors (4509033183610).

7977520247798 is a wasteful number, since it uses less digits than its factorization.

7977520247798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173424353238.

The product of its (nonzero) digits is 871274880, while the sum is 74.

Subtracting 7977520247798 from its reverse (8977420257797), we obtain a palindrome (999900009999).

The spelling of 7977520247798 in words is "seven trillion, nine hundred seventy-seven billion, five hundred twenty million, two hundred forty-seven thousand, seven hundred ninety-eight".