65421604878 has 64 divisors (see below), whose sum is σ = 158221309440. Its totient is φ = 17616310272.

The previous prime is 65421604873. The next prime is 65421604889. The reversal of 65421604878 is 87840612456.

It is a self number, because there is not a number n which added to its sum of digits gives 65421604878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65421604873) 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, 58375 + ... + 366402.

It is an arithmetic number, because the mean of its divisors is an integer number (2472207960).

Almost surely, 2^65421604878 is an apocalyptic number.

65421604878 is an abundant number, since it is smaller than the sum of its proper divisors (92799704562).

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

65421604878 is a wasteful number, since it uses less digits than its factorization.

65421604878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425001.

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 65421604878 in words is "sixty-five billion, four hundred twenty-one million, six hundred four thousand, eight hundred seventy-eight".