51020666 has 8 divisors (see below), whose sum is σ = 76561524. Its totient is φ = 25500160.

The previous prime is 51020653. The next prime is 51020677. The reversal of 51020666 is 66602015.

It can be written as a sum of positive squares in 2 ways, for example, as 50822641 + 198025 = 7129^2 + 445^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6116 + ... + 11808.

Almost surely, 2^51020666 is an apocalyptic number.

51020666 is a deficient number, since it is larger than the sum of its proper divisors (25540858).

51020666 is a wasteful number, since it uses less digits than its factorization.

51020666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10176.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 51020666 is about 7142.8751914058. The cubic root of 51020666 is about 370.8930606261.

The spelling of 51020666 in words is "fifty-one million, twenty thousand, six hundred sixty-six".