51280066 has 4 divisors (see below), whose sum is σ = 76920102. Its totient is φ = 25640032.

The previous prime is 51280063. The next prime is 51280067. The reversal of 51280066 is 66008215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 46991025 + 4289041 = 6855^2 + 2071^2 .

It is not an unprimeable number, because it can be changed into a prime (51280063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820015 + ... + 12820018.

Almost surely, 2^51280066 is an apocalyptic number.

51280066 is a deficient number, since it is larger than the sum of its proper divisors (25640036).

51280066 is a wasteful number, since it uses less digits than its factorization.

51280066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25640035.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 51280066 is about 7161.0101242772. The cubic root of 51280066 is about 371.5205649707.

The spelling of 51280066 in words is "fifty-one million, two hundred eighty thousand, sixty-six".