51667565 has 8 divisors (see below), whose sum is σ = 62159640. Its totient is φ = 41228352.

The previous prime is 51667547. The next prime is 51667571. The reversal of 51667565 is 56576615.

It can be written as a sum of positive squares in 4 ways, for example, as 702244 + 50965321 = 838^2 + 7139^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51667565 - 2¹⁴ = 51651181 is a prime.

It is a Curzon number.

It is a congruent 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, 11030 + ... + 14999.

It is an arithmetic number, because the mean of its divisors is an integer number (7769955).

Almost surely, 2^51667565 is an apocalyptic number.

It is an amenable number.

51667565 is a deficient number, since it is larger than the sum of its proper divisors (10492075).

51667565 is a wasteful number, since it uses less digits than its factorization.

51667565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26431.

The product of its digits is 189000, while the sum is 41.

The square root of 51667565 is about 7188.0153728272. The cubic root of 51667565 is about 372.4540189179.

The spelling of 51667565 in words is "fifty-one million, six hundred sixty-seven thousand, five hundred sixty-five".