51662533 has 4 divisors (see below), whose sum is σ = 55636588. Its totient is φ = 47688480.

The previous prime is 51662521. The next prime is 51662549. The reversal of 51662533 is 33526615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33526615 = 5 ⋅6705323.

It can be written as a sum of positive squares in 2 ways, for example, as 29778849 + 21883684 = 5457^2 + 4678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51662533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51662495 and 51662504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51662593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987008 + ... + 1987033.

It is an arithmetic number, because the mean of its divisors is an integer number (13909147).

Almost surely, 2^51662533 is an apocalyptic number.

It is an amenable number.

51662533 is a deficient number, since it is larger than the sum of its proper divisors (3974055).

51662533 is a wasteful number, since it uses less digits than its factorization.

51662533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974054.

The product of its digits is 16200, while the sum is 31.

The square root of 51662533 is about 7187.6653372288. The cubic root of 51662533 is about 372.4419271960.

The spelling of 51662533 in words is "fifty-one million, six hundred sixty-two thousand, five hundred thirty-three".