65551622478 has 16 divisors (see below), whose sum is σ = 131151318480. Its totient is φ = 21842528576.

The previous prime is 65551622473. The next prime is 65551622483. The reversal of 65551622478 is 87422615556.

65551622478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65551622473) and next prime (65551622483).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 65551622478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65551622471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1985325 + ... + 2018072.

It is an arithmetic number, because the mean of its divisors is an integer number (8196957405).

Almost surely, 2^65551622478 is an apocalyptic number.

65551622478 is an abundant number, since it is smaller than the sum of its proper divisors (65599696002).

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

65551622478 is a wasteful number, since it uses less digits than its factorization.

65551622478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006131.

The product of its digits is 4032000, while the sum is 51.

The spelling of 65551622478 in words is "sixty-five billion, five hundred fifty-one million, six hundred twenty-two thousand, four hundred seventy-eight".