66412165254416 has 10 divisors (see below), whose sum is σ = 128673570180462. Its totient is φ = 33206082627200.

The previous prime is 66412165254377. The next prime is 66412165254419. The reversal of 66412165254416 is 61445256121466.

It can be written as a sum of positive squares in only one way, i.e., 58859584000000 + 7552581254416 = 7672000^2 + 2748196^2 .

It is not an unprimeable number, because it can be changed into a prime (66412165254419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2075380164185 + ... + 2075380164216.

Almost surely, 2^{66412165254416} is an apocalyptic number.

It is an amenable number.

66412165254416 is a deficient number, since it is larger than the sum of its proper divisors (62261404926046).

66412165254416 is a wasteful number, since it uses less digits than its factorization.

66412165254416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150760328409 (or 4150760328403 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 53.

The spelling of 66412165254416 in words is "sixty-six trillion, four hundred twelve billion, one hundred sixty-five million, two hundred fifty-four thousand, four hundred sixteen".