77870775791 has 4 divisors (see below), whose sum is σ = 78673567392. Its totient is φ = 77067984192.

The previous prime is 77870775737. The next prime is 77870775839. The reversal of 77870775791 is 19757707877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19757707877 = 3307 ⋅5974511.

It is a cyclic number.

It is not a de Polignac number, because 77870775791 - 2²² = 77866581487 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 (77870771791) 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, 401395655 + ... + 401395848.

It is an arithmetic number, because the mean of its divisors is an integer number (19668391848).

Almost surely, 2^77870775791 is an apocalyptic number.

77870775791 is a deficient number, since it is larger than the sum of its proper divisors (802791601).

77870775791 is an equidigital number, since it uses as much as digits as its factorization.

77870775791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802791600.

The product of its (nonzero) digits is 42353640, while the sum is 65.

The spelling of 77870775791 in words is "seventy-seven billion, eight hundred seventy million, seven hundred seventy-five thousand, seven hundred ninety-one".