66417218904976 has 15 divisors (see below), whose sum is σ = 128683424788411. Its totient is φ = 33208593153136.

The previous prime is 66417218904973. The next prime is 66417218905013. The reversal of 66417218904976 is 67940981271466.

The square root of 66417218904976 is 8149676.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×66417218904976² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66417218904973) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31579995 + ... + 33617413.

Almost surely, 2^{66417218904976} is an apocalyptic number.

66417218904976 is the 8149676-th square number.

It is an amenable number.

66417218904976 is a deficient number, since it is larger than the sum of its proper divisors (62266205883435).

66417218904976 is an frugal number, since it uses more digits than its factorization.

66417218904976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4074846 (or 2037421 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 70.

The spelling of 66417218904976 in words is "sixty-six trillion, four hundred seventeen billion, two hundred eighteen million, nine hundred four thousand, nine hundred seventy-six".