51663236615 has 4 divisors (see below), whose sum is σ = 61995883944. Its totient is φ = 41330589288.

The previous prime is 51663236591. The next prime is 51663236627.

51663236615 is nontrivially palindromic in base 10.

51663236615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51663236615 - 2¹⁸ = 51662974471 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

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, 5166323657 + ... + 5166323666.

It is an arithmetic number, because the mean of its divisors is an integer number (15498970986).

Almost surely, 2^51663236615 is an apocalyptic number.

51663236615 is a deficient number, since it is larger than the sum of its proper divisors (10332647329).

51663236615 is a wasteful number, since it uses less digits than its factorization.

51663236615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10332647328.

The product of its digits is 583200, while the sum is 44.

The spelling of 51663236615 in words is "fifty-one billion, six hundred sixty-three million, two hundred thirty-six thousand, six hundred fifteen".