66403016 has 8 divisors (see below), whose sum is σ = 124505670. Its totient is φ = 33201504.

The previous prime is 66403009. The next prime is 66403021. The reversal of 66403016 is 61030466.

It can be written as a sum of positive squares in only one way, i.e., 41860900 + 24542116 = 6470^2 + 4954^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4150181 + ... + 4150196.

Almost surely, 2^66403016 is an apocalyptic number.

It is an amenable number.

66403016 is a deficient number, since it is larger than the sum of its proper divisors (58102654).

66403016 is a wasteful number, since it uses less digits than its factorization.

66403016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8300383 (or 8300379 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66403016 is about 8148.8045749055. The cubic root of 66403016 is about 404.9449013089.

The spelling of 66403016 in words is "sixty-six million, four hundred three thousand, sixteen".