51121666 has 16 divisors (see below), whose sum is σ = 83324160. Its totient is φ = 23433840.

The previous prime is 51121657. The next prime is 51121717. The reversal of 51121666 is 66612115.

It is a super-2 number, since 2×51121666² = 5226849469231112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20521 + ... + 22876.

It is an arithmetic number, because the mean of its divisors is an integer number (5207760).

Almost surely, 2^51121666 is an apocalyptic number.

51121666 is a deficient number, since it is larger than the sum of its proper divisors (32202494).

51121666 is a wasteful number, since it uses less digits than its factorization.

51121666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43449.

The product of its digits is 2160, while the sum is 28.

The square root of 51121666 is about 7149.9416780838. The cubic root of 51121666 is about 371.1376380402.

The spelling of 51121666 in words is "fifty-one million, one hundred twenty-one thousand, six hundred sixty-six".