66400466 has 16 divisors (see below), whose sum is σ = 108781920. Its totient is φ = 30146880.

The previous prime is 66400457. The next prime is 66400469.

It is a happy number.

66400466 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (66400469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31745 + ... + 33771.

It is an arithmetic number, because the mean of its divisors is an integer number (6798870).

Almost surely, 2^66400466 is an apocalyptic number.

66400466 is a deficient number, since it is larger than the sum of its proper divisors (42381454).

66400466 is a wasteful number, since it uses less digits than its factorization.

66400466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 66400466 is about 8148.6481087356. The cubic root of 66400466 is about 404.9397176954.

It can be divided in two parts, 66400 and 466, that added together give a palindrome (66866).

The spelling of 66400466 in words is "sixty-six million, four hundred thousand, four hundred sixty-six".