66375475690 has 16 divisors (see below), whose sum is σ = 119522773800. Its totient is φ = 26539764160.

The previous prime is 66375475667. The next prime is 66375475693. The reversal of 66375475690 is 9657457366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65500676761 + 874798929 = 255931^2 + 29577^2 .

It is a super-2 number, since 2×66375475690² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66375475693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1276501 + ... + 1327480.

Almost surely, 2^66375475690 is an apocalyptic number.

66375475690 is a deficient number, since it is larger than the sum of its proper divisors (53147298110).

66375475690 is a wasteful number, since it uses less digits than its factorization.

66375475690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606537.

The product of its (nonzero) digits is 28576800, while the sum is 58.

The spelling of 66375475690 in words is "sixty-six billion, three hundred seventy-five million, four hundred seventy-five thousand, six hundred ninety".