51662665 has 8 divisors (see below), whose sum is σ = 63507528. Its totient is φ = 40321920.

The previous prime is 51662641. The next prime is 51662671. The reversal of 51662665 is 56626615.

It can be written as a sum of positive squares in 4 ways, for example, as 8838729 + 42823936 = 2973^2 + 6544^2 .

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

It is not a de Polignac number, because 51662665 - 2¹¹ = 51660617 is a prime.

It is a Duffinian number.

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, 125802 + ... + 126211.

It is an arithmetic number, because the mean of its divisors is an integer number (7938441).

Almost surely, 2^51662665 is an apocalyptic number.

It is an amenable number.

51662665 is a deficient number, since it is larger than the sum of its proper divisors (11844863).

51662665 is a wasteful number, since it uses less digits than its factorization.

51662665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252059.

The product of its digits is 64800, while the sum is 37.

The square root of 51662665 is about 7187.6745196204. The cubic root of 51662665 is about 372.4422443975.

The spelling of 51662665 in words is "fifty-one million, six hundred sixty-two thousand, six hundred sixty-five".