66475555764 has 12 divisors (see below), whose sum is σ = 155109630144. Its totient is φ = 22158518584.

The previous prime is 66475555763. The next prime is 66475555801. The reversal of 66475555764 is 46755557466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 66475555698 and 66475555707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66475555763) 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, 2769814812 + ... + 2769814835.

It is an arithmetic number, because the mean of its divisors is an integer number (12925802512).

Almost surely, 2^66475555764 is an apocalyptic number.

It is an amenable number.

66475555764 is an abundant number, since it is smaller than the sum of its proper divisors (88634074380).

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

66475555764 is a wasteful number, since it uses less digits than its factorization.

66475555764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5539629654 (or 5539629652 counting only the distinct ones).

The product of its digits is 105840000, while the sum is 60.

The spelling of 66475555764 in words is "sixty-six billion, four hundred seventy-five million, five hundred fifty-five thousand, seven hundred sixty-four".