66213754475 has 54 divisors (see below), whose sum is σ = 91460758116. Its totient is φ = 47159266400.

The previous prime is 66213754469. The next prime is 66213754483. The reversal of 66213754475 is 57445731266.

It is not a de Polignac number, because 66213754475 - 2¹⁰ = 66213753451 is a prime.

It is a super-2 number, since 2×66213754475² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 251763194 + ... + 251763456.

Almost surely, 2^66213754475 is an apocalyptic number.

66213754475 is a deficient number, since it is larger than the sum of its proper divisors (25247003641).

66213754475 is an equidigital number, since it uses as much as digits as its factorization.

66213754475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 338 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 50.

The spelling of 66213754475 in words is "sixty-six billion, two hundred thirteen million, seven hundred fifty-four thousand, four hundred seventy-five".