51671663 has 4 divisors (see below), whose sum is σ = 52379568. Its totient is φ = 50963760.

The previous prime is 51671611. The next prime is 51671677. The reversal of 51671663 is 36617615.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36617615 = 5 ⋅7323523.

It is a cyclic number.

It is not a de Polignac number, because 51671663 - 2¹⁶ = 51606127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51671063) 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, 353843 + ... + 353988.

It is an arithmetic number, because the mean of its divisors is an integer number (13094892).

Almost surely, 2^51671663 is an apocalyptic number.

51671663 is a deficient number, since it is larger than the sum of its proper divisors (707905).

51671663 is an equidigital number, since it uses as much as digits as its factorization.

51671663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707904.

The product of its digits is 22680, while the sum is 35.

The square root of 51671663 is about 7188.3004249962. The cubic root of 51671663 is about 372.4638656900.

The spelling of 51671663 in words is "fifty-one million, six hundred seventy-one thousand, six hundred sixty-three".