77805355552 has 24 divisors (see below), whose sum is σ = 155690433612. Its totient is φ = 38264928000.

The previous prime is 77805355427. The next prime is 77805355553. The reversal of 77805355552 is 25555350877.

It can be written as a sum of positive squares in 2 ways, for example, as 77687068176 + 118287376 = 278724^2 + 10876^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77805355552.

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 3 ways as a sum of consecutive naturals, for example, 19927699 + ... + 19931602.

Almost surely, 2^77805355552 is an apocalyptic number.

It is an amenable number.

77805355552 is an abundant number, since it is smaller than the sum of its proper divisors (77885078060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77805355552 is a wasteful number, since it uses less digits than its factorization.

77805355552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39859372 (or 39859364 counting only the distinct ones).

The product of its (nonzero) digits is 7350000, while the sum is 52.

The spelling of 77805355552 in words is "seventy-seven billion, eight hundred five million, three hundred fifty-five thousand, five hundred fifty-two".