51215479722 has 96 divisors (see below), whose sum is σ = 125707510656. Its totient is φ = 14933721600.

The previous prime is 51215479703. The next prime is 51215479723. The reversal of 51215479722 is 22797451215.

51215479722 is a `hidden beast` number, since 5 + 12 + 1 + 547 + 97 + 2 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51215479723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 549403 + ... + 635825.

It is an arithmetic number, because the mean of its divisors is an integer number (1309453236).

Almost surely, 2^51215479722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51215479722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62853755328).

51215479722 is an abundant number, since it is smaller than the sum of its proper divisors (74492030934).

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

51215479722 is a wasteful number, since it uses less digits than its factorization.

51215479722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86556 (or 86553 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The spelling of 51215479722 in words is "fifty-one billion, two hundred fifteen million, four hundred seventy-nine thousand, seven hundred twenty-two".