66344378 has 4 divisors (see below), whose sum is σ = 99516570. Its totient is φ = 33172188.

The previous prime is 66344363. The next prime is 66344407. The reversal of 66344378 is 87344366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87344366 = 2 ⋅43672183.

It can be written as a sum of positive squares in only one way, i.e., 55995289 + 10349089 = 7483^2 + 3217^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16586093 + ... + 16586096.

Almost surely, 2^66344378 is an apocalyptic number.

66344378 is a deficient number, since it is larger than the sum of its proper divisors (33172192).

66344378 is a wasteful number, since it uses less digits than its factorization.

66344378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33172191.

The product of its digits is 290304, while the sum is 41.

The square root of 66344378 is about 8145.2058291979. The cubic root of 66344378 is about 404.8256690136.

The spelling of 66344378 in words is "sixty-six million, three hundred forty-four thousand, three hundred seventy-eight".