51666422 has 4 divisors (see below), whose sum is σ = 77499636. Its totient is φ = 25833210.

The previous prime is 51666413. The next prime is 51666443. The reversal of 51666422 is 22466615.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12916604 + ... + 12916607.

It is an arithmetic number, because the mean of its divisors is an integer number (19374909).

Almost surely, 2^51666422 is an apocalyptic number.

51666422 is a deficient number, since it is larger than the sum of its proper divisors (25833214).

51666422 is a wasteful number, since it uses less digits than its factorization.

51666422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25833213.

The product of its digits is 17280, while the sum is 32.

The square root of 51666422 is about 7187.9358650450. The cubic root of 51666422 is about 372.4512723973.

The spelling of 51666422 in words is "fifty-one million, six hundred sixty-six thousand, four hundred twenty-two".