51276657680 has 80 divisors (see below), whose sum is σ = 120551730624. Its totient is φ = 20281766400.

The previous prime is 51276657647. The next prime is 51276657713. The reversal of 51276657680 is 8675667215.

It is an interprime number because it is at equal distance from previous prime (51276657647) and next prime (51276657713).

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7131047 + ... + 7138233.

Almost surely, 2^51276657680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51276657680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60275865312).

51276657680 is an abundant number, since it is smaller than the sum of its proper divisors (69275072944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51276657680 is a wasteful number, since it uses less digits than its factorization.

51276657680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8184 (or 8178 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 51276657680 in words is "fifty-one billion, two hundred seventy-six million, six hundred fifty-seven thousand, six hundred eighty".