66388034 has 4 divisors (see below), whose sum is σ = 99582054. Its totient is φ = 33194016.

The previous prime is 66388013. The next prime is 66388073. The reversal of 66388034 is 43088366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43088366 = 2 ⋅21544183.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 4214809 = 7885^2 + 2053^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16597007 + ... + 16597010.

Almost surely, 2^66388034 is an apocalyptic number.

66388034 is a deficient number, since it is larger than the sum of its proper divisors (33194020).

66388034 is a wasteful number, since it uses less digits than its factorization.

66388034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33194019.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 66388034 is about 8147.8852471055. The cubic root of 66388034 is about 404.9144441540.

The spelling of 66388034 in words is "sixty-six million, three hundred eighty-eight thousand, thirty-four".