77805355551 has 24 divisors (see below), whose sum is σ = 131648396544. Its totient is φ = 40418365680.

The previous prime is 77805355427. The next prime is 77805355553. The reversal of 77805355551 is 15555350877.

It is not a de Polignac number, because 77805355551 - 2¹⁰ = 77805354527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77805355494 and 77805355503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77805355553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24056935 + ... + 24060168.

It is an arithmetic number, because the mean of its divisors is an integer number (5485349856).

Almost surely, 2^77805355551 is an apocalyptic number.

77805355551 is a deficient number, since it is larger than the sum of its proper divisors (53843040993).

77805355551 is a wasteful number, since it uses less digits than its factorization.

77805355551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48117131 (or 48117124 counting only the distinct ones).

The product of its (nonzero) digits is 3675000, while the sum is 51.

The spelling of 77805355551 in words is "seventy-seven billion, eight hundred five million, three hundred fifty-five thousand, five hundred fifty-one".