66400274 has 8 divisors (see below), whose sum is σ = 102292428. Its totient is φ = 32302800.

The previous prime is 66400261. The next prime is 66400277. The reversal of 66400274 is 47200466.

It can be written as a sum of positive squares in 2 ways, for example, as 65205625 + 1194649 = 8075^2 + 1093^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66400277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448577 + ... + 448724.

Almost surely, 2^66400274 is an apocalyptic number.

66400274 is a deficient number, since it is larger than the sum of its proper divisors (35892154).

66400274 is a wasteful number, since it uses less digits than its factorization.

66400274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897340.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 66400274 is about 8148.6363276318. The cubic root of 66400274 is about 404.9393273944.

The spelling of 66400274 in words is "sixty-six million, four hundred thousand, two hundred seventy-four".