66603016 has 8 divisors (see below), whose sum is σ = 124880670. Its totient is φ = 33301504.

The previous prime is 66603007. The next prime is 66603029. The reversal of 66603016 is 61030666.

It can be written as a sum of positive squares in only one way, i.e., 35354916 + 31248100 = 5946^2 + 5590^2 .

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, 4162681 + ... + 4162696.

Almost surely, 2^66603016 is an apocalyptic number.

It is an amenable number.

66603016 is a deficient number, since it is larger than the sum of its proper divisors (58277654).

66603016 is a wasteful number, since it uses less digits than its factorization.

66603016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325383 (or 8325379 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 66603016 is about 8161.0670870910. The cubic root of 66603016 is about 405.3510465434.

The spelling of 66603016 in words is "sixty-six million, six hundred three thousand, sixteen".