51634478218783 has 4 divisors (see below), whose sum is σ = 51653680333120. Its totient is φ = 51615276104448.

The previous prime is 51634478218759. The next prime is 51634478218793. The reversal of 51634478218783 is 38781287443615.

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 51634478218783 - 2⁵ = 51634478218751 is a prime.

It is a super-2 number, since 2×51634478218783² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51634478218723) 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, 9601053135 + ... + 9601058512.

It is an arithmetic number, because the mean of its divisors is an integer number (12913420083280).

Almost surely, 2^{51634478218783} is an apocalyptic number.

51634478218783 is a deficient number, since it is larger than the sum of its proper divisors (19202114337).

51634478218783 is a wasteful number, since it uses less digits than its factorization.

51634478218783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19202114336.

The product of its digits is 216760320, while the sum is 67.

The spelling of 51634478218783 in words is "fifty-one trillion, six hundred thirty-four billion, four hundred seventy-eight million, two hundred eighteen thousand, seven hundred eighty-three".