66303557138 has 64 divisors (see below), whose sum is σ = 130614570240. Its totient is φ = 24508956672.

The previous prime is 66303557137. The next prime is 66303557141. The reversal of 66303557138 is 83175530366.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66303557092 and 66303557101.

It is not an unprimeable number, because it can be changed into a prime (66303557137) 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, 121106 + ... + 383762.

It is an arithmetic number, because the mean of its divisors is an integer number (2040852660).

Almost surely, 2^66303557138 is an apocalyptic number.

66303557138 is a deficient number, since it is larger than the sum of its proper divisors (64311013102).

66303557138 is a wasteful number, since it uses less digits than its factorization.

66303557138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262771.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 66303557138 in words is "sixty-six billion, three hundred three million, five hundred fifty-seven thousand, one hundred thirty-eight".