66038733550 has 12 divisors (see below), whose sum is σ = 122832044496. Its totient is φ = 26415493400.

The previous prime is 66038733499. The next prime is 66038733581. The reversal of 66038733550 is 5533783066.

It is a happy number.

It is a super-2 number, since 2×66038733550² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66038733550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 660387286 + ... + 660387385.

It is an arithmetic number, because the mean of its divisors is an integer number (10236003708).

Almost surely, 2^66038733550 is an apocalyptic number.

66038733550 is a deficient number, since it is larger than the sum of its proper divisors (56793310946).

66038733550 is a wasteful number, since it uses less digits than its factorization.

66038733550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320774683 (or 1320774678 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 46.

The spelling of 66038733550 in words is "sixty-six billion, thirty-eight million, seven hundred thirty-three thousand, five hundred fifty".