66405276250 has 40 divisors (see below), whose sum is σ = 127364805216. Its totient is φ = 25944366000.

The previous prime is 66405276193. The next prime is 66405276253. The reversal of 66405276250 is 5267250466.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 66405276197 and 66405276206.

It is not an unprimeable number, because it can be changed into a prime (66405276253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 563974 + ... + 671473.

Almost surely, 2^66405276250 is an apocalyptic number.

66405276250 is a deficient number, since it is larger than the sum of its proper divisors (60959528966).

66405276250 is a wasteful number, since it uses less digits than its factorization.

66405276250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235512 (or 1235497 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 66405276250 in words is "sixty-six billion, four hundred five million, two hundred seventy-six thousand, two hundred fifty".