66664450 has 12 divisors (see below), whose sum is σ = 123995970. Its totient is φ = 26665760.

The previous prime is 66664447. The next prime is 66664453. The reversal of 66664450 is 5446666.

It is an interprime number because it is at equal distance from previous prime (66664447) and next prime (66664453).

It can be written as a sum of positive squares in 3 ways, for example, as 55219761 + 11444689 = 7431^2 + 3383^2 .

It is not an unprimeable number, because it can be changed into a prime (66664453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666595 + ... + 666694.

Almost surely, 2^66664450 is an apocalyptic number.

66664450 is a deficient number, since it is larger than the sum of its proper divisors (57331520).

66664450 is a wasteful number, since it uses less digits than its factorization.

66664450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333301 (or 1333296 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 66664450 is about 8164.8300655923. The cubic root of 66664450 is about 405.4756389169.

The spelling of 66664450 in words is "sixty-six million, six hundred sixty-four thousand, four hundred fifty".