7977582857797 has 4 divisors (see below), whose sum is σ = 9117237551776. Its totient is φ = 6837928163820.

The previous prime is 7977582857767. The next prime is 7977582857851.

It is a happy number.

7977582857797 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7977582857797 - 2³⁹ = 7427827043909 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 (7977582857707) 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, 569827346979 + ... + 569827346992.

It is an arithmetic number, because the mean of its divisors is an integer number (2279309387944).

Almost surely, 2^{7977582857797} is an apocalyptic number.

It is an amenable number.

7977582857797 is a deficient number, since it is larger than the sum of its proper divisors (1139654693979).

7977582857797 is a wasteful number, since it uses less digits than its factorization.

7977582857797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139654693978.

The product of its digits is 30494620800, while the sum is 88.

The spelling of 7977582857797 in words is "seven trillion, nine hundred seventy-seven billion, five hundred eighty-two million, eight hundred fifty-seven thousand, seven hundred ninety-seven".