51646932480 has 1280 divisors, whose sum is σ = 210658516992. Its totient is φ = 10616832000.

The previous prime is 51646932473. The next prime is 51646932499. The reversal of 51646932480 is 8423964615.

It is a tau number, because it is divible by the number of its divisors (1280).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1259681260 + ... + 1259681300.

Almost surely, 2^51646932480 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 51646932480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105329258496).

51646932480 is an abundant number, since it is smaller than the sum of its proper divisors (159011584512).

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

51646932480 is a wasteful number, since it uses less digits than its factorization.

51646932480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 51646932480 in words is "fifty-one billion, six hundred forty-six million, nine hundred thirty-two thousand, four hundred eighty".