51643578763 has 12 divisors (see below), whose sum is σ = 61698839232. Its totient is φ = 43069546800.

The previous prime is 51643578743. The next prime is 51643578787. The reversal of 51643578763 is 36787534615.

It is a happy number.

It is not a de Polignac number, because 51643578763 - 2⁵ = 51643578731 is a prime.

It is a super-2 number, since 2×51643578763² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51643578703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14240763 + ... + 14244388.

It is an arithmetic number, because the mean of its divisors is an integer number (5141569936).

Almost surely, 2^51643578763 is an apocalyptic number.

51643578763 is a deficient number, since it is larger than the sum of its proper divisors (10055260469).

51643578763 is a wasteful number, since it uses less digits than its factorization.

51643578763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28485202 (or 28485195 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 55.

The spelling of 51643578763 in words is "fifty-one billion, six hundred forty-three million, five hundred seventy-eight thousand, seven hundred sixty-three".