51646873290 has 128 divisors (see below), whose sum is σ = 137088391680. Its totient is φ = 12386254848.

The previous prime is 51646873277. The next prime is 51646873331. The reversal of 51646873290 is 9237864615.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17464492 + ... + 17467448.

It is an arithmetic number, because the mean of its divisors is an integer number (1071003060).

It is a 2-persistent number, because it is pandigital, and so is 2⋅51646873290 = 103293746580, but 3⋅51646873290 = 154940619870 is not.

It is the magic constant of a 4692 × 4692 magic square.

Almost surely, 2^51646873290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51646873290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68544195840).

51646873290 is an abundant number, since it is smaller than the sum of its proper divisors (85441518390).

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

51646873290 is a wasteful number, since it uses less digits than its factorization.

51646873290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 51646873290 in words is "fifty-one billion, six hundred forty-six million, eight hundred seventy-three thousand, two hundred ninety".