66387478366 has 48 divisors (see below), whose sum is σ = 110702141424. Its totient is φ = 29833760000.

The previous prime is 66387478363. The next prime is 66387478373.

It is a happy number.

66387478366 is nontrivially palindromic in base 10.

66387478366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66387478366² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66387478298 and 66387478307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66387478363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21531861 + ... + 21534943.

It is an arithmetic number, because the mean of its divisors is an integer number (2306294613).

Almost surely, 2^66387478366 is an apocalyptic number.

66387478366 is a deficient number, since it is larger than the sum of its proper divisors (44314663058).

66387478366 is a wasteful number, since it uses less digits than its factorization.

66387478366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089 (or 4078 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 64.

The spelling of 66387478366 in words is "sixty-six billion, three hundred eighty-seven million, four hundred seventy-eight thousand, three hundred sixty-six".