551252432778 has 64 divisors (see below), whose sum is σ = 1118392399872. Its totient is φ = 181125584640.

The previous prime is 551252432777. The next prime is 551252432827. The reversal of 551252432778 is 877234252155.

It is a self number, because there is not a number n which added to its sum of digits gives 551252432778.

It is not an unprimeable number, because it can be changed into a prime (551252432777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82606050 + ... + 82612722.

It is an arithmetic number, because the mean of its divisors is an integer number (17474881248).

Almost surely, 2^551252432778 is an apocalyptic number.

551252432778 is an abundant number, since it is smaller than the sum of its proper divisors (567139967094).

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

551252432778 is a wasteful number, since it uses less digits than its factorization.

551252432778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7499.

The product of its digits is 4704000, while the sum is 51.

The spelling of 551252432778 in words is "five hundred fifty-one billion, two hundred fifty-two million, four hundred thirty-two thousand, seven hundred seventy-eight".