51440066 has 8 divisors (see below), whose sum is σ = 77205504. Its totient is φ = 25704900.

The previous prime is 51440047. The next prime is 51440071. The reversal of 51440066 is 66004415.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2690 + ... + 10493.

It is an arithmetic number, because the mean of its divisors is an integer number (9650688).

Almost surely, 2^51440066 is an apocalyptic number.

51440066 is a deficient number, since it is larger than the sum of its proper divisors (25765438).

51440066 is a wasteful number, since it uses less digits than its factorization.

51440066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15136.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 51440066 is about 7172.1730319339. The cubic root of 51440066 is about 371.9065601443.

The spelling of 51440066 in words is "fifty-one million, four hundred forty thousand, sixty-six".