51520666 has 8 divisors (see below), whose sum is σ = 81348480. Its totient is φ = 24404508.

The previous prime is 51520643. The next prime is 51520709. The reversal of 51520666 is 66602515.

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, 677866 + ... + 677941.

It is an arithmetic number, because the mean of its divisors is an integer number (10168560).

Almost surely, 2^51520666 is an apocalyptic number.

51520666 is a deficient number, since it is larger than the sum of its proper divisors (29827814).

51520666 is a wasteful number, since it uses less digits than its factorization.

51520666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355828.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 51520666 is about 7177.7897712318. The cubic root of 51520666 is about 372.1007021084.

The spelling of 51520666 in words is "fifty-one million, five hundred twenty thousand, six hundred sixty-six".